While there are many improvements in GT6, there are also some shortcomings.
I'd like this thread to stay on the topic of things that are in the game that you feel are either bugged, glitched, broken, changed in a negative way from a previous game, etc. with the hopes that Polyphony will recognize some of the issues and resolve them.
This is NOT for the obvious things that have been stated a million times (I want more premiums, a livery editor, better car sounds, etc.). This is NOT a whining/wish list.
These things come to the top of my head. I will add more as I continue playing the game.
(Hopefully not too many more
)
These are in no particular order and is more of a personal list, however, if a user posts an issue that is quite bothersome, I may add it to the list. If issues on this list are fixed in an update, I will cross them out.
- Cannot copy vehicle settings from one tab to another.
- Power limiter does not update PP/HP figures while adjusting making it time consuming and difficult to judge amount needed. (Edit: same situation with ballast.)
- Tire screech on comfort tires is horrendous.
- Cannot remove wings from some cars (e.g. Supra RZ, no reason you shouldn't be able to).
- There is automatic traction control, regardless of grip settings, in areas off the course, making it impossible to drift some of the best sections in the game.
- Power curve graph is somehow worse than in GT5. How do you expect us to tune accurately PD?
- "Reset to default" option seems to be gone from adjustable parts (transmission, suspension, etc.).
- The RA function for adjusting vehicle aids during a race is gone, why? (Edit: Seems to be enabled for DFGT wheels only).
Cannot, from what I can tell, disable specific tracks from the in-game soundtrack (Like in GT5). Individual track options are under the gallery function.
Using your real name online should be optional (it kinda is, you can put a fake name, regardless the option should still be there). Your PSN Name is now used online as of v1.02.
- Auto replay after race is annoying.
- There's no shuffle racing... wow
- The top speed value no longer changes when adjusting final gear (like in GT5).
- Nitrous doesn't give relative power increase value. What does "x"% nitrous add to the HP/TQ?. (it's probably a percentage of overall power)
- A regular fully customizable transmission (not dog clutch) seems to be removed from
quite a few MANY too many cars, making it impossible to use H-Pattern shifter.
- Karts cannot be used on tracks that have weather making some of the best tracks for karting unusable.
- Having to hit the "cancel entry" every time you leave track to edit your tune/change car is tedious.
- While looking at car stats in an online lobby, it does not tell you what rev your max HP/Torque is at. This is compounded by the terrible transmission editor and power curve graph.
- The "Next" option while doing license tests is gone. Bring it back. (Would also be useful for Goodwood/events with same regulations)
- Cannot re-size map.
You can apparently use any word for your first/last name. I've seen some interesting names online. Fixed v1.02
- Cannot customize on screen HUD to the same extent as in GT5 e.g. remove time from HUD. (Would like even more options as well, movable time/map/gauges/etc.)
- You can no longer see to what extent a lobby is restricted anymore. No PP value, no HP limit, no tire restriction, only the highlight where it indicates it has been restricted.
- Having to change driver aids after every event is very tedious. (There should be a global default option menu)
- Driving aids shouldn't be forced on, like SRF with Goodwood events/license tests.
- E-brake now has some input delay. (Whether or not this is intentional I do not know.)
- There are some very noticeable dips in performance, frame rate needs improved, especially for cockpit view. Drift lobbies are typically very laggy, often suffering from non-stop screen tearing due to the smoke.
- Lobby music still apparently has it's own playlist from what I can tell, and I can't edit it. (Same thing in GT5, still extremely frustrating, at least for me.)
- Light dispersion, both headlight and tail lights, is quite poor for AI cars. (Haven't checked online races yet) Online is quite poor as well.
- There's no online/friends leaderboards for A-Spec events/mission races/coffee break challenges/one make/Goodwood/Lunar Rover. Why not? In fact, why not make all A-Spec events a type of playlist online as well?
- Still cannot do vehicle maintenance online. (At least let us change the oil.)
- Cannot filter online lobbies by other useful parameters like other driver aids/tire restriction/pp limit/hp limit/weight limit/NASCAR/gt300/gt500/rally/stock/karts/one make/drag etc, etc, etc. SHUFFLE (IF WE HAD IT) There should also be a "race type" option for each of these, or at the very least rally/drag/kart, instead of only having "race for fun, race for real, drift and free run."
- Driving line seems to randomly turn on while online. (Seems to be due to changing some settings on your car)
- Frame rate stutters when somebody enters course.
- FFB response for wheel users disappears for a second when somebody enters course. (Might be caused by #34)
- Tires/wheels can glitch at slow speeds, looking like they're spinning or burning out.
- Cannot see what track others have voted for while you're deciding.
- Unlike in single player, during online lobbies, if you have on different tires/aids than what the host designated, it does NOT switch them automatically for you.
- Some variations of Silverstone do not produce tire smoke.
- Players get removed from track even if the host looks at the settings without changing them, or changes a setting that does not affect the physics (number of laps for instance).
- PP system seems more arbitrary now. Aerodynamic changes do not affect the PP value, and adding/decreasing weight only slightly affects it. Tires/suspension/drivetrain/nos still don't affect the value.
- While solo qualifying, the blindside indicator still registers the other opponents.
- The clutch is still terrible.
- The stockyard seems to be bugged, which can result in deleted cars.
- Considering you can use paint chips infinitely, it would be useful to know which paint chips you've already obtained, while buying a car.
- It's much more difficult going through your garage of cars and tuning them. Now you need to go through about 5 menus and must switch to a car before you tune it.
- NOS indicator continuously and erratically flashes after the first button press.
Replay view options for roof forward/reverse do not work while spectating live, or while watching a replay. Seems to be fixed.
- Cars that have been de-winged still produce a shadow as if they still have a wing.
- Your best time is no longer saved into track history during a free run. (Like in GT5)
- Give us an option for standing/rolling start in every mode.
The credit payout curve is indeed terrible. It seems like credit payouts have been altered in some way to make microtransactions more appealing. 
(May have been fixed with login bonuses introduced with patch v1.02)
There are no sign in bonuses anymore. As of patch v1.02 we now have login bonuses. (I still miss the free paint chips)- PP values for opponents is not shown in any single player events (arcade, a-spec).
- Change oil and engine rebuild options no longer tell you how much power you gain.
- During a replay, live or saved, it still shows what song is currently playing even if you have music disabled.
- Smoke seems to be more dense and lingers longer than in GT5 even with low hp/tq cars.
- Saved replays do not work in some cases, freezing the system.
- Player names are now forced on at all times during a replay.
- Rewind function during a replay does not seem to work properly.
- Can no longer use L1 and R1 with a DS3 to navigate menus if you have a wheel plugged in. (At least with a G27)
Opinions (There is some whining here):
I miss some of the old community features, uploading pictures, uploading custom courses, (obviously we couldn't do that yet anyway) message board, friends stats/cars, car sharing, etc. I have a strong feeling however that some of these features will be returning in a future update.
I also have a strong dislike towards auto viewer after buying a vehicle (I know it's tradition) and the "completing work" after vehicle maintenance. I simply would like an option to skip those animations. I wont put that on my list because I know PD would never remove them and it's more of a wish than anything.
It makes NO sense to me when game developers take out fully functional, working, useful, sometimes critical elements of a game from a sequel. This absolutely infuriates me. I realize PD are under deadlines/stretched thin, but come on. Some of these things are elementary to the genre. How can I efficiently tune my my car when I can't tell the values? What am I supposed to do, eyeball it?
. I have turned the system off, hit the "restore files" option after startup and still it does it every single time now. Can't watch a single replay now without crashing the ps3 
Anyone please help if you can. Thanks. Flying to Germany 8 hours after I post this so my reply may take a little while. Thanks and have a Merry Christmas and Happy New Year guys!!! 
