The multiplayer games aren't run on servers, the host advantage is still there and really noticeable. Host hammerburst is just crazy. That's probably my biggest problem with the multiplayer. I've had some strange glitches, one of them involving me getting knocked down by a smoke grenade and never being able to stand up but still being able to aim and shoot (my character was partially stuck under a car in gridlock), but never anything crazy like a 6 person team like I've hard has happened.
Some people just have a hard time connecting to certain hosts, I've been unable to join some rooms because of their connection and those same people haven't been able to join mine. Anyone having trouble connecting with a friend usually has that problem, you just need a third person to start the room and you'll be fine.
Leavers suck, host advantage sucks (or rules depending on how you look at it), blindfire shotgun/anything sucks and everything else is great.
Anyone else think the boomshot really shouldn't have gotten an extra shot? It takes out 3/5ths of a team now, although it's harder to get those shots on people due to stopping power and the general power of the mid range weapons. I also feel like the torque bow got a huge upgrade, like the hitbox for the shots got bigger.
Minor things aside, great game.