Junglers have an unfair amount of impact on the game (In solo queue)
I know that riot has made some attempts to remedy this, but so far I don't they have gone far enough. When you think about it, all three lanes have similar amount of impact. Bot probably has the most because it as 2 champs per side, but a fed mid or top can still smash both of them if they get ahead. Junglers on the other hand, can have a massive impact on every single lane AND objectives. This is why players often say "Better jungler wins", because most of the time, its true. I don't know exactly how riot can fix this, but I think junglers should be more encouraged to fight the other jungler, or to farm jungle camps instead of ganking, because usually one of the lanes just becomes 3v2 or 2v1 with the jungler camping it after about 3 minutes.