I've played a few of these games, and I also think it's an issue with the core mechanics. Each match can be around forty-five minutes long. So it's really easy to dig a hole for yourself and spend a lot of the game getting repeatedly beat down. Then add in the high learning curve, and small teams. This means that a single player who's learning the game or trying out a new strategy can potentially cause his entire team to lose.
If you intentionally set out to design a game that turned all your players into assholes you'd be hard-pressed to come up with a better system.
If you intentionally set out to design a game that turned all your players into assholes you'd be hard-pressed to come up with a better system.