He's not overpowered. He's a snowballing jungler. His early game and clear is fairly weak more so with nerfs he's already suffered, and pre-six ganks are only okay. however, if you can pull off good plays, then you can transition into a hell of a good initiator. --- Tired of photobucket and imageshack? Ask me about dropbox.
He's weak early on and prone to being counterjungled which is why he isn't used in competitive play. He's far better in non-organized play where he can get fed and snowball. --- You are now blinking and breathing manually. http://i.imgur.com/j8p5fA8.png