Read the book and skip the movie.

the books are incredible. the lingering sense of dread that is evoked through VanderMeer's writing can't be beat!

i'm still going to see the movie, however. ;)

What’s wrong with the movie?

The books are excellent and the movie looks like a CGI nightmare and what I’ve seen in the trailers, appears to deviate greatly from the books

The books are excellent, I agree. And from reviews I've ready, it does seem to diverge greatly. But they don't claim it's a CGI nightmare, and none of this means that the movie doesn't stand alone as a excellent bit of Sci-Fi.