Might be odd, but not very surprising to me.
For two reasons, mainly: One, GT's got a cult following (as does Kazunori, I feel). It's a high profile title and it's a franchise that people have been playing since the early nineties, in some cases. Giving a game a bit of a free pass under those circumstances isn't unheard of. I know plenty of people who're doing the same for their beloved franchises. I've got a friend who's going berserk whenever someone says that Final Fantasy isn't what it used to be, for example
Second, there was NFS: Shift 2 and it was made by SMS. Sure, I do think that it was mostly EA being a ****** publisher that caused that game to be released as a buggy, crippled mess of a game instead of what SMS might have wanted to do with it, but others might not keep that in mind - or care. And they're therefore going to scrutinize PCARS a lot more thoroughly than they'd do otherwise. Can't blame anyone for doing that. Might not be the most fair thing to do, but completely understandable
That said, folks who play on consoles might have a worse experience than I do - and I tend to forget that. My PC version runs fine and I don't care about the career mode... Playing a shoddy console port and going for the most buggy part of the game is bound to give someone a worse impression than the one I got. As I said, I gotta admit that I do tend to forget that