Overall, really liked it. Thematically interesting. Good performances. Interesting premise.
Some things I didn't care for:
- Unclear plotting. I know this was intentional, but it's really hard suspend disbelief that a Chinese general would drop everything after some random woman called him up. Why did the aliens come? Just to give Louise the language? That's never explained. Neither are huge 12 "pieces". If they are keys to understating the language as a whole, didn't they give all that to Louise already? The whole international intrigue bit makes little sense.
- Over explained finale. We get it. Ian is the dad. The movie could've ended 5 minutes sooner, and probably on a more powerful note,too.
-Some slower pacing in the beginning, but interesting enough to keep me interested.
-Lots of jumping around for sake of expediency. Never focused on the charcters problem solving, just the reaction to be results. Which I get, but it loses some impact when revelations happen.
-The whole premise of language affecting our perception of time is a throwaway revelation for the sake of the plot. This very interesting idea could've been explained or expanded on more. The way it was presented was as if the viewer should just take it as face value, even though it makes literally no sense offhand.
I really liked it overall, though. I thought the themes and questions raised were very interesting and the narrative structure overall was commendable, looping back on itself. I also really liked the sybollic nature of everything.
I guess my gripes from the fact that it seems like portions of the film were edited to more appease general audiences (over explanation, international doomsday plot altogether, etc). Overall, though, great film.
Edit: Free will does not exist in this film, no matter what the screenwriter says. It's impossible to see into your determined future if it can change. How would Louise get the general's phone number if she had the ability to choose not to call him? She couldn't. The only way this paradox works is if everything is set.
Double Edit: I figured out a way to explain my thoughts. In the end, it trades philosophy and symbolism for emotion and gravitas. I think this works for a lot of people, but I miss the questions. SF has always been about that for me. And good SF can be emotional and philosophical, but it seems like Arrival can only handle one at a time, albeit well.