That is why I always go for intel+nvidia configs in my comps... most games are compatible with them, not that ATI isn't good or anything (just to avoid any flames) but over the years I see more nvidia compatible games than ATI along with the starting "nvidia the way its meant to be played logo thingy...) maybe it's that nvidia pays more money to game companies I dunno...
I only owned (back in 2003) one ATI card in my life and although I don't question the quality, I hated the driver support.