I wish a had a option called "Matched with no premades"
Because no matter how you look at it, it sucks. Even if I had two wait additional 2 minutes if I queue up for a ranked, I would use it.
Either you have two players on the same skill level (which rarely happens) who then have the advantage of skype/ts, etc.
Or, in the more typcial cases: you have one slightly better player and one who is absolutly horrible. Not saying that he's not trying his best, but in most cases that player just plain sucks, because he is playing on a level that is somewhat above his own. The biggest problem: one good player will influence the game less than a bad one. The team is only as good as the weakest part and if that one sucks and feed you pretty much play a 4vs6.
Not to forget that premades have the magical ability to flame twice as much as your average player from my experience. Well, no surprise if the bad player in the duo is just getting frustrated because he's getting stomped by people way above his level. But then the better play also has the sudden need to "defend" his premade from any kind of criticism and will start flaming too, resulting in an unbearable toxic game.
Tl;dr, give us a no preamde option for ranked, thx