"Urgot is strong/op" dogma.
Before Urgot was played in LCS, everyone said Urgot was shite and only a small pocket of people understood that he was fairly strong in the right hands. Someone plays him in the LCS and wins a game and ever since then Urgot is op.
No, he isn't and hasn't been since 2011. People aren't use to seeing a decent Urgot and because their preconceived expectations were so low for Urgot, anyone having any marginal success with him is that much more of a surprise.
Like most old champions, he doesn't adapt well to the gameplay changes and the various creeps (mobility, power, ect.) and just stays stagnant albeit a yearly buff to keep him marginally relevant for long-time mains.
He's about average in the right hands and nothing more.