The movie itself had many scientific flaws, but what made the movie amazing for me where the parts played by Charlize Theron, Noomi Rapace, and mostly, Michael Fassbender. The plot was also enjoyable, but not the best. What bothered me the most about it was that it masked itself as an amazing sci-fi film, but had so many factual errors.
The acting and the artistry of the movie made me love it.
It sucked. It didn't feel very original and there were so many scenes that should never have been made. Also, I pretty much knew almost exactly what was going to happen in every scene just from watching the main trailer.
As a movie on it's own, I would say it was OK. But has the prequel to Aliens, or even a Aliens movie... it was BAD. There are a lot of inconsistencies and a lot of gaps in the story, the entire movie goes from being an "adventure" to a "teenage oriented screaming in frenzy" in ONE scene. And that ending was poor... very, very poor.
[SPOILER ALERT!] On a plus side, I loved that the enginers looked exactly like Seth from Super Street Fighter 4!!!
It's a good hardcore Sci-Fi movie, it's not a space opera or space marines; it's simply pure sci-fi goodness. It has many philosophical themes similar to what Ridley Scott touched on in Blade Runner. Visually the technology was a lot of fun; and every last one of the Alien designs are straight out of HR Geiger's old art book Necronomicon. The movie itself purposely left you asking questions, like the original Alien movie; which is fun if you like an ongoing mystery and pondering questions you may not get answers to. Judging from the bad reviews floating around most people that don't like it tend to share the theme that they wanted all of their questions answered; but I think the point of a movie like this isn't to answer all questions, it's to make the audience ask them.
One thing I found very interesting was the way Ridley used lighting in the movie, instead of hiding things in darkness like in Alien, he shows you and the suspense comes purely from how strange and bizarre everything is. I do recommend seeing it in 3-D simply because unlike other 3-D movies, this was actually shot with 3-D cameras.
I agree about the philosophical questions it raises, and I did like that aspect. However, I think you have to look past a lot of bad writing, clunky and meaningless plot reveals, and nonsensical character behavior to enjoy it. I don't think there is anything hardcore about it, saying that is just trying to belittle people with views that differ from yours as "casual".