Ready Player One by Ernest Cline is an entertaining science fiction novel, but not a particularly good one. The whole concept feels like the author looked for a way to cash in on his extensive knowledge of 1980s pop culture. The only reason why I'm still going to watch the movie is because it's directed by Stephen Spielberg.
Finally, here's a list of my favorite science fiction novels (inspired by this):
1. Vernor Vinge: Rainbows End