Ok, I will relate my own personal experience. I currently own an Elsa Geforce 2 GTS, I never questioned the 2D quality because it was supposedly as good as it gets for the Geforce 2 family. I just recently purchased a Samsung 170T LCD, and I connected it to the Geforce 2 GTS, it appeared to be only slightly better than my current CRT (Samsung 1100p), but not as good as most of the LCDs I've seen. I thought this was kind of strange, but chalked it up to me having connected it via analog instead of digital. Yesterday I picked up a Hercules Prophet III, and connected it to the LCD still using the analog connection, and OH MY GOD THE COLORS, THE CLARITY!!! it was like getting a whole new LCD monitor!
To recap, I think Geforce 2D is total crap, the Geforce 3 has very nice 2D.