He needs a team to work with but he is great in dominion, he is just a bad solo queue pick unless you go bot with him. His entire kit is great when defending/taking towers, you just need the to make the most of it. Also unlike in SR, his passive is moderately decent since people die alot more.
Just because he cannot solo everything in under 5 seconds and be everywhere at once like Kassadin doesn't mean he is bad. He's a better version of Nidalee.
Give him a good Naut or Alistar or something as a bodyguard and he will absolutely wreck face.