Personally, I'm having trouble believing you could get a decent framerate for Quake 2 on an 060-based machine with any graphics card. I'll put the definition of 'decent' at something morelike 'acceptable', let's say 25 - 30 fps.
Ok, so Quake 1 ran on an 060 at something like 12fps IIRC. I'm not sure whether I'd expect Q2 to run better, even though it has OpenGL and hardware acceleration in its favour. The amount of CPU calls even when hardware acceleration is being used properly is still very high, and the higher spec the graphics card, the better the CPU required to push the data required by the graphics card.
I remember getting [on Q2] 13 - 20 fps on a P166MMX overclocked to 200MHz, with a 3D accelerator graphics card (Permedia 2 based, 4MB), and that was with detail options toned down, and 512x384x16 resolution.
I realise that an 060 generally performs much better than a same-clock x86 processor, but not so much better that it could do Q2 that well.
Hyperion, screenshot please? I can't remember whether the max fps command works on Q2, if not, a timedemo console result is good, that'll indicate easily enough what the colour depth and resolution is as well. It won't indicate texture detail though.