This game is very very good I thoroughly enjoyed it and considering i bought it for PS3 and PC just to prove a point I guess i enjoyed it more on PC as it is an FPS game and in my opinion thats how it should be i would say go for it if you wanna buy it...
I bought it last year. played it through three times. the online time challenges are cool and will keep you busy but its like deatheater says, its not very long
It is more interesting than fun. It has one idea that it stretches out for the whole campaign. That idea is running and jumping at speed - compared to say driving. They kind of lacked the imagination to flesh it out properly. I think if they work on it the follow-up can be a great game. It is just an interesting experiment for now.