Saw Ready Player One last night (on Easter too, how fitting) and it was not as good as I may have dreamed by much better than I feared. Curiously, my wife loved it so maybe knowing the source material is a detriment since it felt to me like every third chapter was missing. They kept the basic framework, characters and premise but changed almost everything else: the quests were changed to make them more movie-friendly (who wants to watch someone play Zork?), the plot streamlined and some character roles changed. There's more "outside" stuff going on than in the book, probably so you weren't just watching one long cartoon.
I had fun. Most of the criticisms I've seen are valid but didn't bother me much and didn't bother Flea at all. I'd be interested to hear more impressions from people who hadn't read the book but don't know how large of a group that is: our theater was only 50% full and it wasn't an particularly large theater. Not great for its first weekend.
Edit: Not that my anecdote is necessarily data since RPO seems to have had a fairly successful opening.
Edited, Apr 2nd 2018 10:04am by Jophiel