I find movie reviews to be fun if I've already seen the movie. In almost all cases, I haven't, since I don't tend to go see movies as soon as they're released - or usually, ever. Arrival is one of those extremely rare cases where I actually want to see a movie, and I'll still probably wait until some time after it hits Netflix.
So in the most part, movie reviews aren't useful to me. That's not to say that I don't think they should do them. Other people obviously enjoy them, and I am more than capable of hitting fast-forward (thanks to Steve, by the way, for editing in the end time to make that easy).