Three quick suggestions, the first is a must.
1. Change body type mid game!! Absolutely a MUST.
2. Put kills and deaths on the scoreboard!! I don't care if some clown got more exp than me because he sat around handing out ammo packs all day (and that's fine, I love the teamwork/gameplay factor of this game) but I'd still like to see a kill/death on the scoreboard. It was probably left out to influence teamwork and doing the objectives... but you've already influenced that by making kills very little experience. You don't have to cut out seeing kills and deaths completely.
3. DON'T change the game too much! It's pretty awesome. People complaining about the weapons or balance or this and that are fat losers and shouldn't be taken seriously.
