Eh... I'm not sure where to start. Although MW2 has a good storyline, I kinda like COD BO's is better. The characters are more diverse, and the storyline goes into Mason's stumble into insanity. The multiplayer is actually more fun, I believe, in MW2, though. Even though the killstreaks are a bit overpowered, I like the weapons and attatchments. COD BO's weapons are unique by themselves, but if you find the right, you have an overpowered, almost unstoppable loadout, and it requires almost no skill. If there is one thing I don't like about MW2's multiplayer is the nukes. Yu end the game early. The only easy way to obtain it is camping, so a lot of people are quick to try their luck and get it. And that brings me to another problem; the level designs. There are too many areas where you can just crouch and dominate the whole game. There are few, but annoying. This is what I think.