This game is basically a social karma experiment where you either get paired with friendly survivors with a "leave no one behind" attitude, or you get paired the most insufferable losers on this planet that will gun you down and walk over your corpse if it means getting to the destination first.

TLDR: if you think teamwork good; buy game (it's cheap enough as it is), if you think teamwork bad; ♥♥♥♥ OFF!!!