That is an admirable write up, and I don't have much to address on it save for one or two points. He says prior to a typical essay...
Yes, speed is important, but speed is relative. This is why I have enjoyed every race in GT6 so far, even the dinky compact car races, and the introductory Fitt. This is why I find the bots sufficiently challenging to enjoy racing among them, because I can make them faster or slower than me as I choose, based on the car I select to pit against them.I know what you want the bots to be, hardly a surprise, but we have what we have. Or at least I do.
You're being just as unfair judging the bots in GT5 and 6. Besides, my demarcation is fairly stark and sensible. Forza is the one fluke in this, as it has bots which behave much like any simcade or fully arcade racer, while the game is more of a sim. Though the way the Forzas are structured straddles the divide in an odd way, and I doubt any PC sim is going to have bowling challenges in their career as F4 does. Likewise, no PC sim is going to have murderous bots like Forza or NFS, but more orderly ones. Though as you note, they can be stupid in certain ways, such as the GTR bots being incapable of herding through a chicane without turning it into a grinding hell of smashed metal.
And because "the AI are largely similar" in PC sims, regardless of any differences, I don't expect to be amazed in spite of any game I'm presented with. After the harassment from Need For Speed and Forza's bots I've dealt with over the years, and the occasional side panel bump and rear end bash in GT6, PC bots are kind of snoozers for me.
Some of us up the difficulty by nudging virtual little sliders or changing values in a field. Some of us do it by selecting cars of a certain performance range, or tune cars a certain way. As far as I'm concerned, difficulty is difficulty, and this argument has been had a few times already.
For that matter, you're arguing on a philosophical basis. You don't own the game, have played it very little, and you evidently consider Gran Turismo as just one of those diversions available on Playstation as an alternative to Ratchet & Clank or Uncharted. It may or may not be worth a bag of chips to you. It's hard to tell.
To me, Gran Turismo is like winning the lottery, as I said above. It's rather pointless to repeat all the good things it offers me. I don't get any thrill from PC sims, which are essentially made as platforms to support online clubs and leagues, so people can wave virtual trophies and talk about how big their stats are to each other. Cool, so I can occasionally join an online race of people who have tweaked and tuned and mastered the games to the point I'm likely relegated to the bottom third of the pack every race. It's not my idea of fun to find myself in a field of Mike Rotches this close to lapping me all the time. And the bots are polite and boring, and the most interesting thing they might do is move in front of me and block my attempt to pass, or might bump me in a turn. I've seen sim bots fight each other about as much as I have in Prologue, which is rarely.
You'll evidently put up with a certain amount of crud from your PC sims. I'll put up with a certain amount of crud from GT6, and especially GT6, because the physics and car dynamics are up there with the Live For Speeds of the sim world. And GT6's car list stomps every other game in existence, with a nice selection of tracks for them to run around on. The fact that the bots will slow down at the end of a race isn't the end of the world to me, as long as I can stage races that I'm not guaranteed to win. Plus, acting like the game will never change is a little short sighted. This game was built from the ground up for enhancement.
It seems like you guys who like to complain about any number of things - endlessly - are particularly grouchy because we don't hop onto the gripe train. As if we think the game is paaarfect. I encountered I think TWO whole posters who thought GT5 was a 10. I don't know anyone yet who thinks GT6 is flawless. Great, maybe, but not perfect. So take heart, we're almost on the same page.