while it is true, that some games are better for a certain brand of card than others...
the resolution really matters, i don't know where you got your idea from. please enlighten me otherwise. resolution is not meaningless. there is a reason why certain cards have been priced at certain levels of performance, not all cards can handle 2000+ resolution and have high details on and run nicely.
by your logic, a 8800GT would be better at running crysis on high. reso, than lets say a 4870x2, even though crysis runs better on nvidia cards. ATI cards run some games at a faster FPS than a Nvidia card and vice versa, but usually those differences are not night and day where that game would "smash" the sytem.