The quality of the Disney+ Marvel shows is on par with the movies, IMO. And the books that are exploding because of the shows are due to speculation of characters that appeared, will be appearing, or of which there are hints that they could appear, where there wasn't really room for that in the movies (except for White Vision, which did see a minor spike when it looked like he might be in the movies). The Disney+ shows are appealing to a wider audience than just geeks. I don't think that the DC shows that featured King Shark did that.