The most OP thing in this game is luck of the draw teammates
Seriously, if you get lucky and get team mates that actually want to win, are in a good state of mind, playing their mains, and not lagging you are golden.
I get very disappointed when I get teammates who are first timing a champ in ranked, or are lagging right from the start of a match (like why even queue up?) and the worse one has to be when they have emotional strength as tender as a babies'; they rage at the first sign of something they dislike, and either AFK or become toxic boomboxes.
I know it isn't Riot's fault, it's the community itself. Still, I can't help but feel disappointed when I have to deal with bully champions in the top lane for the first 20 minutes of the game while playing my one trick (Wukong), only to find out that its all for naught because John Doe has his panties in a bunch, or thought it'd be fun to first time a champion in ranked... making it close to impossible to win at that point. Truly a sad situation to be in. This community needs to do better, and stop ruining games for others.