I think there's a consensus amongst long time GT fans that GT6 was not great either. It had a lot of content, but it isn't well remembered:
In the spirit of the 20th anniversary, what is your favorite GT game? I've included most in the poll with help from wikipedia. In case any are missing, I've added a other at the bottom. For me, GT Sport takes the top prize. I am in love with this new format.
www.gtplanet.net
It is the second lowest voted for in the above poll of all of the main GT titles.
Regarding updates, if a game is engaging enough, has good content and is making good use of that content but has no updates, it'll hold my attention longer than a game that isn't making use of it's content that's receveing updates. GT7 isn't holding my attention. I booted it up yesterday morning for 30 minutes just to see the update, it won't go on again now until the next update at the earliest. That's not a sign of engaging updates or gameplay in the slightest.
This time in, I was still playing GT2, I was still playing GT3, I was still playing GT4. Part of the reason I don't play as much is me, I'm older, I'm married, I have less free time, but when I do have a spare hour here and there I don't feel like booting GT7 up. Which is a shame as the foundation is there for it to be very engaging and the best GT to date.
For all it's flaws, IMO GT6 had a better career structure than GT7 does, GT7's is arguably the worst in the series. The game isn't the worst, but it's career structure is down there with GT5's. GT5's may take the title of
the worst though for all the driver level locked stuff and cars you needed appearing once every blue moon in the UCD. But at least you controlled progression of the UCD and didn't have to wait literal months for a car you wanted to appear. So maybe it's very close.
My main point however, is that updates shouldn't be required to make a game good or engaging, if a game isn't good at lauch, if it lacks the career mode, features or engaging gameplay, then most players will ditch the game regardless of updates. A few will keep on playing. It does happen, but it's rare that a game launches in a poor state and recover its reputation through updates, but those updates are often significant and change the gameplay/key flaws in the game, which allow the game is able to recover its reputation.
GT7 right now is in no-mans land. The gameplay is unengaging, the career mode is non-existent, it takes far too long in both grinding and just waiitng for cars you want and the updates aren't fixing the game they're just adding more of the same unengaging, poorly used content