More ideas:
1: Play as a team. You are NOT Rambo. We are not playing CoD, you have a team, you need your team.
2: Stop playing to your enemy's strengths. If you're having a problem with Vagabond, STAY OUT OF THE BLOODY OPEN AREAS. If you have the bomb down, stay with it, don't hunt them down.
3: In fact, remember your objective. If you don't have to go to them, force them to come to you.