Which COD game has less experienced gamers?

I have consistently be annihilated in Mw2 by players who get 30+ kills. Im getting tired of this because i can't walk 5 steps without dying. Just the other day i had an experience with a guy who got 112 kills. He got about 15 chopper gunners and i had about 40 deaths. i am level 70.... anyway im looking for another cod game that doesn't have as many experienced players. Which one is the best? i heard WAW is good?