Well this is a surprise. I just found it in Cydia, it's called Quake 3 Arena HD. It downloads a demo when you run it, and you can add game files that you own through iTunes (although I can't get that to work)
The graphics are pretty good, and you can apparently use skins. There is no lag, but it is pretty hard to control (not as hard as the iPhone version, which was accelerometer based)
I got a screenshot:
The graphics are pretty good, and you can apparently use skins. There is no lag, but it is pretty hard to control (not as hard as the iPhone version, which was accelerometer based)
I got a screenshot: