This should never have been released in this state, its a disgrace. There is absolutely nothing right with the pc conversion, most ati radeon owners and some nvidia cars owners can't even run the game without it crashing after 3-4 mins (including me, and my specs are way above the recommended requirements). The game doesn't look as good as the ps3 version on medium settings, i've done a direct comparison and it looks awful - the resolution's better but the whole thing just looks flat. Frame rates at c30fps with huge drops for no reason, missing textures etc etc the list goes on and on. If you look at the internet evryone's hoping that a patch will sort all these problems out - think again, there are too many and this game is broken and badly optimised beyond belief.
Do not buy in its current state - you will regret it.