I'm 13th, I got the game the first day it came out. I usually only play once a week (Sundays, homework days) and I've played all of the double XP's. I don't think I'm anywhere close to a "no life" or whatever, but I'm not going to try to prove anything on the internet.
edit: I have 9k kills in S&

, which is what I play almost
ALL the time