Not your ordinary FPS.
You do get replay value out of this game, but I have began to get very bored with this game already. You can always go back and do it better then you did before, try and beat your friends score or try and get the all time best score, and you can unlock more skill shots whether it be in the campaign or the echo mode. There's some stuff to go back on in the campaign and receive some achievements. The story in this game could have been more involved then what it was and I ran into a few bugs while playing the campaign, nothing huge, but still. The freedom of movement in this game could have been improved on too. The graphics are nice and the initial design of each level seem great. The characters are very witty and filled with a lot of one liners which are pretty humorous. The weapon designs are great including the add-ons with 'em.
The Echo mode, it times you and allows you to back on each level individually to see how high you can rack points and to see how you do against your friends or on the leaderboard. The multiplayer takes a little getting used to but you'll have it down pat in just one round. If I was to grade the multiplayer I'd give a C-, at times it just a big cluster...yeah, and there isn't much teamwork at all. It also seems that people don't keep to the main objective of the multiplayer either. I do like that it has a ranking system, and there is plenty of customizations to your character and to the weapon.
Overall it's a good game, but it still needs to be fixed/improved on. if you're on the edge of buying it then I'd say go ahead and rent it first.