Greatest Man of Middle-Earth??

[Kuruharan]

Only Man to go to the Halls of Mandos and come back.

I don't see what this has to do with it. He had no say in the matter. That was because of Luthien.

This is going to be a first but I agree with Legolas. Húrin's the Man.

Faced Morgoth and stole a Silmaril (with help of course).

Actually, Beren did not exactly "face" Morgoth. Slunk underneath the throne is more like it.

Húrin not only faced Morgoth, he defied Morgoth to his face for a couple of years. (That's years mind you.) And he was utterly powerless to do anything about it and he still refused to break.

Compared to that the other of his numerable feats of arms, including but not limited to fighting alone against an army, breaking the siege of Eithel Sirion, etc..., all seem rather puny.

As the only Man who ever personally faced and defied The Great Enemy of the World, I don't understand how anyone could make any other nominations.