of course he's not an all time great (yet). but i'm guessing from the wording of your post that thats what your trying to say. the way you make tszyu sound like he wouldn't have beaten any other light welter in the world that night and that beating tszyu is the only thing hatton has achieved in his career tells me your not to keen on the hitman.
i think if he achieves what he keeps saying he's goin to achieve (beating the likes of castillo and maybe even mayweather) then he'll definetly be a modern great. but at the moment ricky has got a lot more to do in the game to gain that position.