What about laughter and joy?
There's a lot of things you can say about superhero movies and sucking, mainly involving bad pacing, boring characterization, bad motivations for super villains, and cliches. But Matt Zoller Seitz shoves all that aside in his denunciation of the form to make what is, to my mind, one of the most tediously wrong assumptions about what makes something artistically valuable or interesting, the assumption that something's worth can be measured by how grim or horrific it is. The main thing that superhero movies do wrong, in his book, is they don't make you sad enough. This is equated with bravery.