Though this has been said before, I'd like to point out that the matchup system when playing together with a friend is completely broken. Whenever I play together with my unranked (lvl 32) friend, We get some ridiculous matchup where I'm the only ranked player (Iron I since I don't play ranked much). while the other team has at least a gold player, 2 silver and 1 bronze. This happens every match where I play together with my friend, but whenever I play alone, I get a normal matchup.
And please don't give me that matchmaking is based on MMR, because the other players are obviously better than our team and isn't even close to balanced.
For the love of gawd, please fix this some day, Riot.