Films that pretend to be really smart but in fact aren't are bound to be more disappointing than films that don't pretend to be anything at all. I can't get my mind around how Alex Garland thought showing a character barfing light while yelling "annihilation" would seems like a satisfying ending (well, it's close to the ending) to a film that is set up in such a "look at how smart I am" way. Same goes for the old trick "kill one = kill all" (with a phosphorus grenade, in this case).
I get the fact that there are lots of ending theories and "hidden meanings", but even these seem really easy to set up if for a movie that doesn't really settle on anything at all. Guess I am just tired of films whose initial "mystery" pulls you in and whose endings aren't anywhere NEAR as interesting as the initial mystery. Okay, I'll stop rambling now.