I liked Ready Player One, but maybe I'm not quite as old and grumpy as 17D_guy. I enjoyed the book, so I knew the movie was going to be a non-stop stream of pop-culture references.
My assessment is that it is a well-executed action movie with pretty good special effects, but if you don't have a nerd streak, you're probably not going to get much out of it. That said, if you read and loved the book, be aware that there are DRAMATIC changes in the story. They almost just took the setting and characters, then built a new story for the movie. On the plus side - you don't have to worry about spoilers. On the minus side - most of the changes were not for the better.