I don't think so - I'd say the opposite, in fact, it's like saying The Expanse is not particularly good sci-fi, because it's primarily concerned with politics and intrigue (most of which is analogous to post-9/11 stuff) and fighting, rather than any kind of actual exploration of ideas. And that'd be slightly unfair on The Expanse, but I don't think deeply unfair. Whereas Bladerunner is about exploring ideas, is asking questions about what makes a human, human and so on, so is to me, much truer SF than The Expanse (likewise, Star Trek asks big questions constantly - and as much as I love DS9, and I think it's the better story and TV show, I would say TNG is "more SF" than DS9).
I don't think merely involving spaceships makes a show really SF in any meaningful sense, beyond the aesthetic. Nor does merely involving people labelled as superheroes really make it a "superhero story" in a real sense. It's also not, not one if that makes sense, but the question asked was "which is the best superhero movie", and I don't think, personally, that can be a movie that is barely interested in superheroes or superheroism beyond the aesthetic. Just my opinion man, but I don't think it's narrow.