He's doing too much damage for the amount of tankiness and sustainability he has. Building executioner's or any other burn/bleed items have no effect on him and he does the same amount if not more damage than assassins. You need at least 3 people to do any real damage on him. His early game is his weakest but he's completely safe since he can throw his cleaver at minions all day long with no worry of getting in range of the enemy champ. No pun intended, but he's toxic for the top lane and unbalanced. No matter if you beat him early and get fed off him, once he hits 6, he goes from being easily beaten to easily beating you.