Heroes. Mainly because most of Marvel's Villains are just heroes for the other side, and are just as noble. Ronin the Accuser was a bad guy against the Fantastic Four, until you realized that he was a honorbound justicar for the Kree Empire. In this light, he's actually a good guy, just for a different team. Likewise Super-Skrull. He's just a champion for the Skrull empire. Galactus isn't a hero, villain or anti-hero. He's more or less a force of nature. Hell, even Thanos isn't a complete villain once you understand what motivates him. He's done about as much good as bad in his run on the comics.