I was a HUGE fan of Quake 3, but Quake 4 just hasn't done all that much for me. I MAY be overtaxing the graphics card of my machine with it, but it seems to skip a bit. The progression of Q4 isn't as pleasing as the kinda plotless Q3 or as smooth to follow as Halo (which is my current favorite!)
Maybe I'll have to try installing it at work on my machine there and play at lunch.... That thing has a LOT more horsepower!