Dude you were absolutely killin it. I was sucking because I was so freakin tired. Earlier in the day I had a decent ratio but it was really bad the last 2 or 3 hours. I think we won every round though.
I should be up for some MP tonight after I work on the wife's car.
Personally, I think all guns (at least, assault) are pretty even. Their stats balance out, and most of my kills last night were from working on the M4. I only have the FMJ and camo challenges left for it. I started working on the TAR21 - that one is fun too. I'm also trying the MP5K but damn it's frustrating at range - sometimes it's too jumpy, and other times it's damn accurate. The Intervention sniper rifle is pretty sweet - that + PP2k make for a sick combo. I still haven't figured how to melee with the shield though.