Don't let the pretty cel-shaded graphics fool you. It's just your average FPS.
The gameplay is nothing new. You run around, shoot people and whack them with random objects. You swim and be stealthy blah blah blah blah. But if you don't really mind this you should enjoy yourself. It is also pretty hard at times.
The graphics are are pretty good. They did a very good job with this part. Because the whole game is supposed to be like a comic book they cel-shaded it to make it look like a comic book. They did a great job with this. But some parts of the game looked bland and boring. So even though they did very good it still could be better.
The sound was good too. They had all the gun shots and explosions and such. They also had spy-like secret agent soundtrack that went well with the game. Something that I personally liked is that whenever an explosion goes off nearby there is a ringing sound and you can hear a heart beat, just like in real life. So overall the sound was good.
I'm not sure if you would really play ths game all the much. Maybe you would play it once through the whole game, but thats really it. They have online play which you could play for awhile but would eventually bore you. So I don't really know how long you would play this game.
Conclusion: It's up to you. I personally would buy another game and maybe get this one if you had nothing better to buy. Maybe just rent it. But like I said it's up to you to decide.