I have both games and I never liked Black Ops. The online gameplay is just so different from MW2 and when you play MW2 for 2 years it's hard to move on to something with different guns, perks, killstreaks, maps... etc. But Black Ops has zombies which is the only thing I really play on it other than campaign. And there's no Nuke or QSing on black ops .
I'm sticking with MW2 I like it and there's nothing I wanna change about it :) Plus, they got rid of all the hackers and boosters in MW2 a while back, which makes me love it even more x).
I enjoy MW2 more, I jumped back on it this past weekend, I took a break from it for a while with playing other games. Rumor is MW3 may be out in Nov, I hope so, I like to see how the single player story plays out from the 2nd game. I do get tired of the nuke in MW2 (mostly seen it happen when people cheat on the pc version of the game), I would say that is a plus side to Black OPs.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.