Garen oh Garen
So.... My last 4 games (one of them got me the ever so lovely demotion) I had Garen on the enemy team every game (I won't get into how Fizz was in 3 out of 4 and the oppressiveness of Shyvana Devourer Jungle in my last who triple killed us even though our jungle was ahead) and he proceeded to just kill everyone, you couldn't kill him.
We kited him with Lulu and Talon slows, he managed to get to us or get away with at least 1/3rd health and before we knew it he healed back up.
Im not sure if its Garen that needs some tweaks (particularly to his spin) or Spirit Visage that just makes healers heal too much, or the new juggernaut items that give this ridiculous movement speed when he isn't meant to have any.