What is Urgot's weakness

In my experience I don't get what Urgot is; he's a lane bully and he scales up to be a tanky almost hyper carry that carry a game in the right hands. He is oppressive but doesn't really fall off like Renekton. I don't understand what this champion's deal is! I'm less scared of Darius/Riven/Irelia then a decent Urgot.
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