By and large, franchises aren't perceived as art. Yet, in the ethos of fan culture, many perceive themselves to be the sacred gatekeepers of their favorite franchises. In reality, it's not that serious.
"Glass" is not a comic book movie. It's not a bleak DC slog, and it's not a Marvel action clusterfuck. It's a suspensful character-led drama with supernatural themes, and in that sense it's unique... if not a little disappointing.