Beyond that, it’s worth pointing out that a “serious” superhero movie isn’t necessarily anything to scoff at.
Does Wolverine lend himself to a serious story more than characters like Superman and Wonder Woman?
It’s possible, but I would advise against painting in broad strokes and making claims that an entire universe is “too serious” in any way shape or form.
Logan is arguably the darkest and most serious superhero movie since Christopher Nolan’s Dark Knight trilogy, and it’s being praised for its grim take on comic book subject matter.