Roy Jones put on as good and dominating performances against the good fighters as he did against the bad.

The best fighters in his prime were Reggie Johnson, Virgill Hill, James Toney, Mike MaCcallum
He was the first guy to ko Hill but before that he was dominating him.
He was the first guy to seriously hurt Reggie Johnson(look his career please), and he won every round in that fight where he landed like 50% of his punches and Reggie landed 10% of his(a very fast southpaw with boxing skills once against watch him against James Toney).
James Toney: Around that time considered the best or second best fighter on the planet, when has anybody dominated the top or one of the top two fighters in the world like that?
Mike MacCallum: He was old, but he still was fighting well if you go by his other fights. Roy played with him, a guy who either a few months before or after fights TOney to a SD.

Who was Roy fighting in his prime that you guys saw him against?
Roy dominated opponents way bigger than him as well, people are picky about his competition, but most of these guys could have foughten at cruiserweight easily, and they would have mauled the likes of Calzaghe, yet Roy's combinations and speed had them usually backing away because they couldn't deal with it.