I don't get what is so difficulty about adding a solo queue and letting duos play in flex. I personally am not even mad about the disadvantage solo players face against a duo, even with a duo on their team, no.
What ruins the game is that at least 1/5 duo bot lanes are absolutely trolling. And Riot does nothing to stop them because technically trolling isn't intent feeding even if they are playing useless champs, not using wards, and spamming troll crap in chat. Who gets the ban? The people actually trying to play the game and getting rightfully pissed about the trolls. What a joke.
Just another reason why everyone I know that is just getting into MOBAs goes straight to HOTS. The IQ of 1 dev at Blizzard is > the IQs of every Riot dev combined.