Upon reading Red Raven's initial post, I think he may have hit everything I thought.

My only other thought is that in comparison to GL and Flash in the late 50's, I think DC did a better job of establishing the character's environment and some semblance of a supporting cast.

In that first Captain America story from Young Men #24, they establish Cap and Bucky in some identities and a setting, but it;s dropped thereafter and anything goes. There's no real supporting cast to speak of. There's a girl named Betty in the Torch stories and a police commissioner but they never really come to anything. Sub-Mariner reads the best to me, partuclarly the story from Young Men #28, as we see his cousin (Is this Dorma's first appearance?), emperor, and his home.

The art is spectacular, I think. Everett is at his strongest, and, while Romita is learning, Burgos never looked better.

Otherwise, the stories are too short. In Marvel Boy, the unrelated horror stories come off more interesting, as they introduce some characters and have some room to flesh out a story. Goodman supposedly always thought the more stories, the better the value.