The PC version is the only version worth playing, IMO. I have both the PC version and PS2 version (and have played the Xbox version.) They can't hold a candle to the PC version. The console editions are plagued with extremely long load times, choppy graphics and frame rates, and terrible draw distances (although the Xbox version performs better in this area than the PS2 version.)
I'd give the PC version a 9/10, while giving the console versions a 5/10.