It's a movie about aliens visiting Earth. It raises some interesting questions, and the aliens themselves are pretty novel which is not something I'd have thought Hollywood could pull off in 2016.
Unfortunately, Arrival's answers to those questions are not particularly interesting, and they don't always make sense.
Visually, the aliens are well done and the effects are tasteful. Unfortunately the rest of the movie seems to have been shot using some kind of Instagram filter that makes everything look like seasonal affective disorder.