Teams that have the greater number of op champions are more likely to win
Deny it all you want, but I can assure you, teams consisting of Miss Fortune, Darius, Xin Zhao, Master Yi, Veigar, Illaloi, Any assassin champion is far more likely to win in contrast to, say, a team that uses champions that are relatively unheard of.
This really sucks the fun out of the game, some champions are becoming neverused and some, overused.