It doesn't look that bad on a GTS if you run it in 32 bit color and apply all the latest patches. It looked really good in opengl with the loki patch, but seeing the muzzle flashes visible when you weren't firing pissed me off, so I went d3d. With the latest patches, it worked out to be quite playable for me--and it surely would be on a geforce 3, though remember that unreal has a lot of dependency on CPU speed. Glide is dead, deal with it man.
I had a lot of fun with Deus Ex, but I didn't figure out how much crap it was until I beat it: I had some 15000 upgrade points left and nearly full ammo when I beat it. (I upgrade pistol once, maxed out small arms, two upgrades to hacking), pretty anticlimatic, I had saved all my HE ammo and Sabot shells for a big boss type, and there never were any. Talk about anti-climatic. Fun game, but crap in a way.