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.
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To be fair, I'm usually too busy healing me team to kill people, of course my K/D will be low!