Trigga has a fair point, I'll take a less skilled team player over a good player that doesn't use teamwork any day. Even if I get angry at randoms for not using teamwork or just running past me to let me die, I do my best to save and protect them when possible.
This is why I'd just like personal stats screen a la Warframe, rather than tied to missions. Screens that show how much you play each raider, weapon, how many kills you've made on each faction, etc.