I honestly see no problem with a roulette like this. However, if you queue with randoms (say the couple is the tank/healer duo), people expect everyone to know what they are doing, and/or have a basic grasp on how your job works by the time you hit endgame. The only problem(s) I see are: When healer isn't actually doing a good job of keeping people alive; Tank isn't trying to keep hate up... (Yes, I've ran into couples like these in expert and level 60 the last few weeks when I'm queued as Bard). I voice my concerns (in a polite manner) saying something about trying to be better. I got kicked once saying something in a civil manner, because the healer was so, so bad. I attempted to give advice to this person, and I got kicked, because of the majority vote of vote kick, and them being a couple and such. That is the only issue I see with couples queued together in dungeons (not saying everyone is like this. I've ran with a bunch of couples that were awesome sauce).

There'll always be bad and good sides to a topic. I just wanted to leave my opinion about this topic here. Please don't take offense to it. ; ;