Is it better or worse than Ready Player One?
Much better, if only because for all its faults it's weird in an inventive way. The "is it cyperpunk or post cyberpunk parody" style of writing, all the deep dive into ancient history and the creation of language, the setting being our world but not really (the aforementioned "Nipponese" thing and the fact that it's seemingly set in a far more technologically advanced version of the 1990s).
It's got some really fun action set pieces as well. IMO, more than a video game or comic adaptation, this would have made for a great 90's style anime.
Anyways, you'll either really enjoy it or come away appreciating some parts while just not liking the novel as a whole. Not a ringing endorsement, but the only way I can recommend reading RPO is if you're between 40 and 50 years old and were really into D&D, arcade games and saturday morning cartoons. If that ain't you, watch the movie instead, because it's much better.