Chromehounds isn't a typical FPS game. Why? For one you are a giant robot hell-bent on destruction, but also multiplayer matches take around 5 to 20 minutes and a lot of searching is involved. This is atypical for a game in this genre because most online FPS matches are fast paced and usually end quickly.
Another aspect of the game that is enjoyable to some is the amount of time that can be spent on manipulating aspects of your Mech to get it in tip-top fighting shape for those long XBOX Live battles.