Thing is, you've basically got two groups of movie-watching people:
1) People who simply want to sit back, watch a movie they like and be entertained
2) People who want to see some deep meaning and 'explored topics' and all that stuff in almost everything
One is of course not better than the other, some people prefer this and others prefer that, but group 1 is definitely bigger and so movies that are more fitting for that category get more credit. Logically.
Like I said, I sort of liked Arrival, it was interesting, but I liked Planet of the Apes more (and no, no deep meaning or whatever in that one, it's just apes taking over the world and let it be that )