I always hear people ragging on WoW's graphics, but personally I think they are fantastic. They have a nice sense of scale and the art direction is, in typical Blizzard fashion, excellent.
On my 7900GT, I've found that disabling dynamic shadows and shadows gives the best compromise in terms of performance and visual quality. I'm able to play with every other setting on max (except AA) with those settings turned off at 1680x1050 and maintain around an average of 45 FPS, which is great.
Einhanderkiller's comments