I don't think Gamespot gave the PC version a fair review... see why.
But the game has a lot of positive aspects that outshine the negatives, in my opinion. To begin, the sound is very good, the graphics are crisp, and the visual style is cool. The character customization is really immersive, as well. And although the single player with bots can be pretty frustrating, it's designed as a multiplayer shooter, and when you're playing with and against people, the different tactics available become more important and exciting.
If not at full price, this game should still be tried out and given a fair chance (which it did not at the hands of Gamespot, IGN, and other reviewers).