Considering GSP destroyed him twice and I beleive broke his title defense streak I am going to have to say no. But he was very dominate.
GSP is way more well rounded. He went several fights without losing a round, sure Hughes finished guys, but I think the guys he beat were not as good as the ones GSP beat. Guys like Joe Riggs, an ancient Royce Gracie, Frank Trigg twice. They are a far cry from Kos, Fitch, Sheilds, ALves, Hughes twice, BJ Penn.