User blog comment:Tankteam/ADC Tierlist/@comment-4900160-20150116233125/@comment-4900160-20150119103724

An AD carry carries because they make use of the holy synergy between AD, AS, Crit, and Crit damage to deal to highest possible DPS via their autoattacks, a DPS that cannot be matched by any caster on the long run. That's what they are for, and that's why they carry. Urgot doesn't do any of that, and never did, since his whole kit revolves around his EQ combo, which prevents him from using his (short ranged) auto attack.

Therefore, Urgot is not an ADC, never was, and probably never will be unless he gets a complete rework.