Exactly my point, all you've read are superhero comics. That's like only watching soap operas and saying that all TV is stupid.
Try reading Maus, ACME Novelty Library, Age of Bronze, or Jason. Or work by Craig Thompson, Joann Sfar, Jeffrey Brown, Chester Brown, Joe Matt or Seth.
You can hold Bone next to almost any fantasy novel. From Hell, and a lot of Alan Moore's work, like The League of Extraordinary Gentlemen, are absolutely brilliant, and books like The Fate of The Artist and The Cute Manifesto are incredible essays on art and artists.
Did you read Time's book of the year this year? It was a comic book, Fun Home, or American Born Chinese, which was nominated for the National Book Award (and won tons of other awards besides).
I'm sorry, but like I said, you are talking as an authority on a subject you know very little about.