Please use them. I'm tired of seeing that one person on my team going 8 and 31. Edit: It's one thing to be providing support but it's an entirely different subject when you're BLINDLY running into the fray and gunfire. If you go negative on the after-report screen and haven't played a supportive role in the team's success/failure (capping objectives, destroying score streaks, etc), I don't want you on my team.