It runs on my machine, but there are some serious bugs with the bots. If I let the bots fight each other they'll go for a while but as soon as I join the game, several things happen: a) I can't move, shoot, or do anything other than look around. b) the AI stops, all bots turn to statues. c) sometimes I spawn in mid air or in odd places. So I can run around by myself in levels with a FPS usually around 30, occasionally dropping to the high teens at 800x600. The physics work fine.
AMD Opteron 165 @2.45GHz | DFI Lanparty Ultra-D | Visiontek 4850HD | 2GB OCZ Platinum | X-Fi XtremeMusic | WD Raptor 74GB | WD Caviar 250GB