Pretty good movie - and the CGI actually makes it a better movie.

Rating: 8/10 (1 April 2018)

I strongly prefer movies that feature people and practical effects, and I generally loathe movies that feature endless CGI sequences. Ready Player One is somewhat unique as the CGI sequences inside the "OASIS" virtual-reality world are far more interesting than the live-action sequences. Coincidentally - or maybe not -- this was also true of the original TRON released in 1982. (More on TRON in a moment.)
Ready Player One is set a few years in the future in a somewhat dystopian Columbus, OH. (Is that redundant?) Much of the population spends most of its time immersed in OASIS, which is far more attractive than their real world. "Gregarious Simulation Systems" (GSS) is the company behind OASIS and is by far the world's largest company. GSS's sole owner died recently and is leaving 100% of the company to the person who solves three online puzzles.
The movie moves back and forth between live actors in the real-world and their CGI avatars in the online world. In terms of the movie-going experience, the online world is far more attractive and interesting than the real-world sequences and some of the sequences - such as the auto race through Manhattan - are breathtaking. The online world is also jam-packed with references to the 1980s such as Back to the Future, Jurassic Park, Batman, etc., etc.
The movie's one weak point is that it's VERY derivative of the original TRON. I kept expecting Jeff Bridges to appear and exclaim "This could be a free system!"
The cast was fine, although - and I may be showing my age here - I had no idea who any of the younger cast members were. (Most of them apparently appear in a lot of TV series.) Among the slightly older cast members, Mark Rylance was wonderful as the recently deceased owner of GSS who pops up frequently in the online world. (He is one of my favorite actors and would be fascinating to watch even if he was reading a phone book.) Simon Pegg appears briefly as his former partner (think Paul Allen, Steve Wozniak or Henry Flagler.)
If you liked TRON, Matrix, Wreck-It Ralph, MMOG or VR, see it now. (It deserves a big screen.) If you don't, skip it.