Meh, compared to the awesome dominance of the M16 in CoD 4 the rifle in MW2 doesn't work as well. Not as accurate, doesn't seem to pack the same punch. And honestly the FAMAS does the same damage, is more accurate, and has less recoil. Granted, I use the M16 more than the FAMAS but neither really stand out as a fantastic weapon. Granted, I say that and I got absolutely owned on Terminal by a guy using an M16 w/EOTech and stopping power. Wow he was good...and he wasn't cheap or a big time camper either.
I'm trying to hit 1000 kills with the MP5K and M4A1 before I prestige. Already done it with the ACR and SCAR-H, I've got 3 1/2 levels to go (including getting to 71). I've only got around 50 kills left with the MP5 but close to 300 with the M4...