Arrival is a science-fiction movie with an unpredictable twist, but doesn't really deserve all the hype of being one of the best movies of 2016!
Due to the aforementioned twist, the trailers and talk-show appearances by actors do not go beyond the first 30 minutes of the movie. Following that trend, I'll only talk about the first act: The director - Dennis Villeneuve of Sicario 2015 fame - has created a melancholic and suspenseful atmosphere (e.g., cloudy skies, dark crowded rooms, long close-ups on actors faces). The acting by Amy Adams is pretty good (not exceptional though). And, the pacing of the movie is done somewhat well. In short, it is one of those movies that you can only see once. If I see it one day playing on TV, I would change the channel instantly.
Keep your expectations low, and you might find it interesting. For me, it was a 6.5/10 at best!