It surprised me how little effort developers put into stopping griefers. I remember in BF1942 getting more annoyed at Dice than the teamkillers themselves, because dealing with them would be so easy. Killed a team-mate? Your next respawn is delayed one deployment cycle. Killed two team-mates? That's two cycles, or a minute IIRC. That gives legitimate players an incentive to be a bit more careful and gives griefing players a whole bucket full of frustration - a taste of their own medicine.

. I don't have long play sessions so I have never teamed up with anyone else