Isn't this a stupid question? Lol, are there winning players at networks like GG (that don't support hud)? There you got your answer
Besides that, alltho myself I'm not a big hud fan either but sure it does help, mostly the basic things like vpip, agression ratio, PFR etc.. More in defail stats like HM & pt provide, which looks like a christmas tree to me, I think is not so important. After all it's not cuz you know a player is known to be this or that, that it will also be the case in a certain hand you are in, only in some cases it can help..