I wasn't a huge fan in black ops of the 3 team kills and you were kicked from the lobby because sometimes you dropped a stealth bomber and you had three people on your team run out and try and catch the bombs. Now though, I'd take it anyday compared to what happens in MW3.
I was playing and a guy/gal came in and just repeatedly team killed our entire team. He ended up 0 and 16 with a -800 score. It seemed like the time penalty was nothing. I found myself having to run away from this person to avoid getting killed. This wouldn't be too bad if it was a rare thing but it's not. Luckily I'll be playing with 5 other friends and don't have to worry about it most times.
It stinks even more that when you get team killed like this it counts against you as far as your deaths. In black ops they didn't do/count this. Why the step backwards?