When it came out it was top notch, but the framerate compared to say Halo today is not good. It is still a worthy purchase if only for the great multiplayer WITH awesome bots. The motion-sickness blur is the only real negative because it lasts way to long.
The weapons are OUTSTANDING. The Laptop Gun and FarSight are cool addtions. Also, you cannot jump. You should be able to get it for $4.99 or lower.