Oh, quite a few here, and really it's been alot more recent.
- The rest of the team who are not throwing their own weight.
- Bastards (on both teams) who spend most of their time killing at random and willing to run over their own teammates to take another kill. (got hit twice by a team member's car because he wanted the kill the opponent I was squaring off in Saints Row 2). That or they're a spoilsport that hates you because you are earning more points on them so thus they start to attack you at random. Yeah, had one or two of them x.x...
- EVERYONE RUNS OUT ON YOU. Within seeing the rosters of teams, then one person leaves, and another, and another. THe game starts, two more leave and you find yourself in a match of 6 vs. you and everyone is an UBER gamer that can take you out in one shot.
- Hackers. I am not exactly sure if it's a glitch, or just some retards setting my team up. It's happened twice recently though, one included the ability of invisibility in a match where ROcket Launchers are the key and they kill you before you can track their movements. The second was when the team were 'supermen' and could take several shotgun hits without dying, and despite the fact that I killed 8 of them (and I was the lousiest shot, mind you), somehow our team wasn't even scoring a point. We all quit soon after.
So really, there are many things, enough to where I don't even want to play Multiplayer more x.x;;