No spoilers except comparing it to other movies in the series:
Super solid entry, very well crafted cinematography. My problem is that it mostly just seems like a rehash of every previous movie crammed into one. It's definitely worth seeing, but i wouldn't say that it's a must see. It's definitely beautiful on the big screen though.
It seems like people that liked Prometheus aren't in love with this movie because there's not really much new or surprising in it.
And those who didn't like Prometheus, love this movie because it goes "back to the roots" of the alien series. It's definitely fanboy material.
Personally, i prefer new ideas and unexpected plots in each movie, so Prometheus was one of my favorites. But if you like a movie that feels familiar you'll love this. It's very similar to Alien Resurrection in plot and feeling, although with less funny moments. With a little Aliens thrown in, and a pinch of Prometheus.
One of my favorite things was the gorgeous views of space and the planets which you really gotta see in a theater or like a 70"+ screen to fully appreciate. They also did a good job of giving a sense of the true effects of gravity and space flight in interesting ways, which was one of the coolest aspects of the movie.
I'm glad i went, but i was a little disappointed that the movie didn't really have much new to add. But in many ways it tied up the loose ends of the other movies and sort of functions as a keystone movie that connects them together chronologically. And Ridley Scott may have been told to tone down the new concepts. Also he was probably a little worn out after the Prometheus series, so this was an opportunity to build back the fan base that wants familiarity, and also a somewhat necessary movie to tie everything together.