Well, I've only seen one GF1 in a system, and I thought the 2D was awful. I ran a Elsa Gladiac (GF2 GTS) in my system for a couple of weeks. The 2D was much better than the GF1, but still not what I consider acceptable. I just picked up an ATI Radeon and love it. Crisp 2D, outstanding 3D quality. The visually quality is close the that of the Matrox G400 that I'm replacing (2D is about the same, 3D is even better). The GF2 is faster than the Radeon (by as much as 25%), but the Radeon just looks so much better.
-AJ