Here's something I won't do in Multiplayer Games; Grief. That's right. You won't ever find me team killing, blocking (never intentionally) teamate passage, destroying team resources, or anything that hinders my teammates by being a neusense.
I was just playing some Battlefield 1943, and one of our teamates was going around blowing up our tanks, our jeeps, our planes, our boats. We were already being stomped by the enemy, and here this guy was hindering our only chance to strike back. No vote kick, no team killing, no repercussions for his actions. Thankfully, he did have to reload, and I was able to grab something before he could take it out.