Dirt 2 was supposedly a 'heavy' joint venture with ATI,.
It just turned out to favor Nvidia DX11 cards because of their increased ability for tessellation performance.
Its used for the water effects. The waving flags.
I disagree. Comparable cards are the 5830 and the GTX460. If you look at the crysis reviews, the 5830 is always (?) on top. Other games show the GTX460 winning many of them, but crysis remains as one of those "runs better on AMD hardware" titles. I have no idea why the OP is asking for a list of them, but the games do exist.