Celebrim
Legend
I generally don't find it particuilarly constructive to obsess over whether something is truly science fiction or not.
I'm not really obsessing about it but I do require a reasonable interest in science and scientific matters before I'd consider something to be science fiction. If people want to think of things as science fiction that have no interest in science, well of course they are free to do so, but they shouldn't expect me to agree. I do think there is value in understanding the difference between science fiction and fantasy and recognizing something as fantasy typically makes it's meaning more clear and allows for deeper analysis of the themes and intentions of the writer.
Star Wars, 2001, Alien, and Gravity are all science fiction movies.
1 out of 4 ain't bad, I guess. Although, I suppose I could give ACC the benefit of the doubt and accept two of those, that would lead to a long discussion of the incoherence of ACC's themes.
And if you hate the Alien universe, it should come to no surprise that you're not a fan of the game either.
I enjoy the movies to some extent, especially Aliens, because of the outstanding well done character of Ripley in that movie. But yeah, as a universe I don't have a lot of interest and playing the RPG only reinforced that. I find that there is a big difference between good media in some other format, and being a good gameable setting and intellectual property. Good settings have room for all sorts of different stories and all sorts of important roles and they tend to have strong internally consistent world building and themes. The gritty feel of the Aliens universe just doesn't match the fact that it isn't actually science fiction, leading to strong incoherence where you are concerned with biology, physics, chemistry, engineering and the gritty facts of survival, when the thing you are fighting isn't playing by those rules.