Oh, definitely! Could never live up to the hype. I mean after so many YEARS of hype what game could!
The game designer even admitted he went overboard and said some things (I think too much graphics detail? can't remember) should have been saved for GT6. Something about the hardware was being pushed to the limit already.
Yes, there are imperfections but I don't need perfection. If you're a GT fan you just want the damn game to play. That's what I didn't like - the 6 year delay.
GT6 will be out sooner than that but I don't think we can expect too much of a leap from GT5 if the designer is already saying its close to being maxed now.
Just enjoy the game and have fun!