I remember when I tried to go back and give GT5 another chance (I had purchased the CE version because I was expecting greatness from the game, so I felt I should purely based on money spent), it was sometime after the first big update which I had read about, and figured "In for a penny...". The update was nearly a gig and took a couple of hours with the PS3's wifi...and that was the last time I turned the game on. On the plus side, at least I can say that I own the GTR the CE came with, even if it's 1:18 scale.
I'm in the Forza camp, and the last one has been spectacular, but Murray has the right of it: ever since I got the STI, racing games don't have quite the same impact as they used to.