Moore was a decent fighter, but I don't think he was genuinely world class.

Maybe him becoming a 'world champ' was the result of the splintering of the title into multiple Alphabet Belts?

Personally, I rate him as high as I would rate Zora Folley, Roland LaStarza, Jerry Quarry and other top level contenders who never quite made it to become champs (and that's not an insult to them)