Rating of 7.7 on March 13, 2018 is way too high...

Rating: 8/10 (13 March 2018)

Sadly IMDB ratings don't say too much about movies anymore. - I gave it a three, up's mostly for production quality, not for the story or acting performances which were extremely poor.
It was the plan to release Annihilation in cinema's worldwide, I mean if you cast 'Natalie Portman', who somehow gets mis-casted quite often . I mean she is neither a ballerina (Black Swan, having the right weight is not nearly enough to look like a ballerina) nor a scientist (Annihilation, The idea alone, a woman does not become a cancer research professor in her early 40's after 7-years of combat experience in the Army. It does not work like that.) - Annihilation became a straight to Netflix movie. Annihilation is like so many of those B-SciFi movies. The only difference in this case is that it is based on a novel and has some A-listers in the cast.
The movie is boring. I bet you fall asleep watching, or quit watching long before the movie ends.