This movie is good, so long as you didn't read the book first

Rating: 7/10 (15 March 2018)

So i had low expectations for this movie considering it was 2 hours long and the book was under 200 pages, and a good chunk of those less than 200 pages were describing the setting, which doesn't take time in movies, because you just see the setting in the background.
Then when I saw the movie, it wasn't even the same plot as the book.
Only 4 characters in the movie are in the book: The Biologist, her husband, the psychologist, and the Boar thingy.
The characters in the book are: The Biologist, The Psychologist, The Anthropologist, The Surveyor, a mentioned linguist who never made it across with them, the Biologist's husband and parents are mentioned throughout the book. In the movie, it is The Biologist(Lena), Her husband, the guy she's sleeping with, The Psychologist, A Morphologist, A Medic, A Physicist, the people quarantining her.
The characters in the book have no names, and this was to keep them from getting too close to each other. The characters in the movie all have names, and they say their names a lot.
In the book, they're investigating a tunnel/tower, and inside is a never-ending script of words that on closer inspections seems to be alive. The Biologist inhales a spore from inspecting the words, making her immune to The Psychologist's hypnosis. The next day the Anthropologist is dead. Biologist is sure Psychologist caused it. She and Surveyor get sent back into the Tower, then psychologist disappears. The Biologist names the creature writing the text The Crawler. There is a lighthouse, and a picture of the lighthouse keeper she sees in the Crawler. Aside from the existence of a lighthouse, none of this is in the movie. She finds her husband's journal and decides to continue searching Area X instead of returning home. (This is the end of book 1) The movie is just them examining a lighthouse. And Lena enters a hole which I'm guessing is the Tower, and meets a creature that mirrors her. Then she's back on regular Earth in quarantine.
In the book, everyone from the previous expedition came home mysteriously, and then died of cancer a few months later. In the movie, the husband is the only one to have come back, and is now dying of organ failure and in isolation.
I didn't think any movie could top Percy Jackson and the Sea of Monsters for a worse book-to-movie adaptation. But Annihilation movie has proven me wrong.