Broken Hitboxes
So as I've been playing through my games I've encountered champions with hitboxes on skills much larger than what it appears to be, now I know they may be coded to be those sizes but please for the love of god make the particle effects the same size as the hitbox itself. I'm tired of seeing Ezreal ults, and w's that miss but somehow managed to hit me, or Leblanc e's THAT COMPLETELY MISS and then magnet back onto the champion like the game is telling you "Sorry you missed that skillshot here have it anyway." The range on Darius' e still needs a bit of tweaking in my opinion, amumu's bandage toss still magnets to people as well. These aren't necessarily super game breaking but they're stupidly annoying.
I'll see if I find anymore.