I finally got around to seeing this. Denis Villeneuve is my favorite recent director and I love sci-fi, so this should've been a home run...
... but I can't help but be disappointed.
Firstly, as a film, it's probably the most simple of his four major ones (Enemy, Prisoners, and Sicario being the others). That's probably not true -- Sicario seems like it's the most direct, at least in plot. But then again, I had more questions about myself and about the characters after watching Sicario than I did after watching Arrival.
"Would I have a child if I knew her life would end in tragedy?" It sounds interesting, and it probably is. I might be a little removed from the subtlety in that question since my wife and I are about to have our third child (fingers crossed) and I wrestle constantly with the question of whether it's morally acceptable to have children at all. I mean, you're creating life where none was before. You're causing a being to suffer, to feel joy, to die -- whether they live to 16 or 106. So I can appreciate that aspect of the film, even if it wasn't novel or particularly insightful to me personally.
As sci-fi... dang. I consider myself pretty big cosmology enthusiast, as far as laymen go, and I can't really get past the premise of 5D beings interacting with our "physics."
It's not like the universe exists and we experience 3 full dimensions and 1 limited dimension: it's that the universe IS a manifestation of these dimensions. A higher-dimensional being would experience a completely different universe and our matter and energy wouldn't even make sense in their world, or vice versa.
Also, pretending a being that exists in all of time simultaneously exists, a la Dr. Manhattan, what does it even mean for that being to "do" something? How could the aliens decide to go somewhere if they have already been there? How can you even have a thought if that thought has already been had? Would the memory of having been about to have that thought mean that you already had the thought before you had it?
And lastly, there's the matter of changing your dimensional existence by changing the language you speak... :/ There's no secret code to unlock here. We are a collection of field vibrations that have formed quarks that have formed atoms that have formed molecules that have formed life. Those field vibrations are vibrations in our 4 dimensions and following the arrow of time. Being alive and "thinking" about something doesn't get to shake you out of your 4-dimensional prison. Neural activity is no more exotic, on a quantum scale, than two rocks smashing into each other in space.
It's a well-made movie. And I still want to see what he does with Blade Runner. But it was my first indication that his "formula," if he has one, is wearing on me. Eh, I probably had my hopes too high.