At level 13 from the mid game to late game he becomes ineffective even with the mid game buff as he isn't a good team fighter, can't split push that well, easy to kite, no engage or peel (unless you count his E ability which has a delay & short distance), so you lose out on a tanky engage by picking urgot for your team, so i guess he can be useful by protecting the carry with his E. Telling you all this from experience since i just got out of a 1hour & 14min game with urgot, won my lane hard but my team was behind and I experienced every point stated above and lost the game. Even though i lost i had a blast playing urgot. love the rework.
(Remember to note which shot gun knee is on cooldown and fight/stay on that section because his passive is his primary source of damage)
Try using these champs against urgot
Rumble - poke & farm safely/dmg on par with urgot/better team fight, mana less
Gnar - better poke & auto range, sustain, mobility to escape urgot w, mana less
Renekton - can dash(s) away from urgot w, sustain, better team fight, mana less
Teemo - If you have no mechanics so you can just blind urgot during urgot W
Riven - super mobile can avoid all of urgot's abilities and win trades by doing so (depends on skill level), mana less, better team fight, etc
kennen - range with autos/abilities, mobile escape for urgot w, better team fight, mana less, in general can destroy urgot top
Ryze - can destroy urgot top to lazy to state why but his snare is big reason part of it, etc etc
Yasuo - windwall for ult/autos, mobile, etc etc
Fiora - can easily reposite urgot's w since it has a delay/tell which then stuns him, Q or dash around him easily to avoid/position around his shot gun knees that are on cooldown. Fun match up