Lol did you even try him?, He is awesome.
His Blastoff + chain lightning combo is serioulsy awesome.
Not to mention you can let the chain lightning "chase" your enemies when they run by just targeting an enemy near him in range
For example you can still hit your enemy when he runs behind a tower by casting chain lightning on the tower, which is great since they probably wont see it coming.
Good thing the Chain lightning got nerfed btw, he was quite OP before this patch.
He may lack some utility, but he is still a force on the battlefield.