If I had never read the book I probably would have really liked this movie, but as someone who thought the book was pretty good (not incredible) this is a let-down. It skips past nearly all of the world- and character-building that the book takes great pains to articulate and instead crams a whole bunch of licensed characters, worlds and names in front of you. A solid 9/10 on the audio-visual front because it looks and sounds fantastic, but it just throws the characters into relationships with one another and does virtually zero storytelling.
Review of Ready Player One
