Just wait for GT 5, dont compare GT 4 with next gen games,
Assasin Creed was a classic example for the optimization problems, PS3 had,
just because it was a new console, now Ubisoft and the rest of the devs have all the proper dev kits and can take advantage of the ps3's superior hardware.
Software problems can be reversed but hardware cant!
When the PS3 will take over, the situation will irriversable, we expect to see the situation to be reversed, starting from this year, MGS 4 might be the starting point
and then when multi- games appear, optimized for all consoles, PS3 will start shining, exclusivities and Blu ray, will deliver the final blow...