I am seeing issues in this forum from code errors to game errors... Is it really that bad? Is it better to buy the original copy of FO3 and buy all DLCs seperatley? I have never had problems with Fallout games on xbox, will I with Ps3?

It freezes and lags quite a bit more on PS3, but so did the vanilla copy I bought in 2008. BGS games just don't play as nice with PS3 as other platforms in general.

That said, none of the freezing and lagging is enough to render the game unplayable, and I never personally experienced any noticeable bugs in 500+ hours of F3 I played on PS3. Clear the game cache occasionally and save often and your experience should be fine.