My goal is to just enjoy the game. I've been getting better each game, and most of my friends are already bored of Call of Duty, so playing solo isn't as fun. 2.14 K/D, and 3.08 W/L ratio playing mostly solo or splitscreen, is pretty good in my opinion. :p
It's always the same for me. When Call of Duty comes out in November, I play a lot for the first 3-4 months, and then it drops a lot in terms of time spent. I've never reached (Legit, at least :carling

max prestige in MW2-present (when I started COD with MW2), since I just can't put time into it, it's getting too boring..
Though I have higher expectations with Black Ops 2, I'll probably not spend a lot of time on it either, as school's more important to me. Especially, since this is my last year in high school (I'll have to spend it with my friends, and keep up my work academically). I have high expectations for myself in the future, so it's best to work hard now, and then relax when/if my goal is achieved (hopefully).