Separate it from the book and you will enjoy. If you read the book pass on it.

Rating: 4/10 (5 April 2018)

Most of the time I read others reviews and go see the movie based on that, this time I read the book first then went to see the movie. I knew there would be changes, there always are in the conversion, but wow...
I went and saw the movie in IMAX 3D which was visually stunning. Everything in the OASIS was crisp and stunning and you wanted time to slow down so you could take it all in. 10/10
As far as character development it was very shallow and it was hard to see the avatars reflected on the personalities of the actors. It was the standard good vs. bad definition a complete black and white contrast with almost no gray areas. It was also given the Hollywood makeover and all of the main characters we mostly without visual flaws and seemed perfect, which is a stark contrast to the book. 2/10
As far as the sound track, it was good and had a few popular songs from the 80's but did not enhance the movie at all. It seemed like everything was thrown in to a nostalgia effect, almost pandering. 3/10
The theme of the 80's was very consistent through the book and being older got most of the references but had to look up just a few. The movie seemed like it was pandering to a younger audience only taking a few songs from the 80's and a few icons from the decade. It seem like it was geared to a gamer audience in their late teens to late 20's. 5/10
As far as the source material from the book, it is almost as if someone read the first 2 chapters then opened the book in three random places and read two pages in a row, and then cobbled the movie together from that. 1/10
The rest of the review is a comparison of the book to the movie.
So just like the movie the book focuses on Wade Watts and him being a Gunter, someone who is obsessed with finding the keys and the egg. The book mostly focuses on him and takes place over the course of a year after the first key is found. the movie seems to speed this up and all keys seem to be found with a few weeks.
All of the challenges to earn the keys are completely different. They completely removed the elements of the gates from the games, which was the challenge that had to be overcome to actually earn the key. Anorak's Almanac was completely removed as being able to be converted to a physical form, which was a key thing in the novel. It instead was converted into a 3D Youtube archive of Halliday's life.
In the movie they added a rebellion/resistance movement which was found nowhere in the book unless you consider the Gunters, but they were either solo or joined a clan and were only together in the OASIS not in real life.
In the movie "The High Five" all lived within what seem Columbus Ohio, where in the book they lived all over the world emphasizing the scale and how integrated people lives and the OSAIS were.
Many of the characters had major flaws such as social anxiety, weight issues, paranoia, etc. in the book. That was all removed for the movie.
There are many many more things that are different, but these are just some of the most standout things that I took away from the movie and book.
If this was approved by Ernest Cline, I hope it was to boots his book sales so people can actually see what a good writer he is and how much better the book was. I hate to be that guy, but please read the book, you will value it so much more than the movie.
tldr: Overall the movie is good as a stand alone, completely separated from the book, but if you are looking for a 2 hour eye-candy/gamer geek-out movie that has little Easter eggs, you will like it.
But, if you have read the book pass on the movie and keep the memory of the book as a gem on your mind so it is not tarnish by the pandering cash grab Spielberg made it.