I second the use of GameRanger. The fact that co-op multiplayer is this game's biggest draw, I don't know how Gearbox managed to screw that up so royally.
Do you even look before you post? It's the thread right below this one, ffs.
Locked until Warped can find another brain cell to rub against his lone one.
Hmmmm, it's between Dead Center and Dark Carnival for me. Although Dark Carnival has playable mini-games, so that might just be the tie-breaker right there.