There's really not much too elaborate here. Too often whenever I play a ROC strike, there's at least one person not playing the game and expecting everyone else to carry him.
I can understand having to take a quick bathroom break or something, but when you're gone for over five minutes, then you're a detriment to the team. By that point, I'd rather you leave and let someone who'll actually help out take your place. I don't care if something comes up in real life or if there's an emergency; if that's the case, then turn off your damn console.
Like in Left 4 Dead, there should be a vote to kick option. The rest of the team shouldn't have to deal with someone who doesn't help out at all. Is such a system prone to abuse? Sure, but I think the benefits outweigh the cons.
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Because the "vote to kick" option worked [i]soooo well[/i] in Left 4 Dead. /sarcasm I would rather not get paired up with a group of two friends who would wait until the final boss is almost dead then kick me.