Fabulous. One of the best novels I've read, it's got details, a world, unique characters, and a good story, it's overall just a great and unique read.
The only "not great" parts are firstly the information bombs that were dropped in the first few chapters, explaining how everything in the game worked and so on, which at first seems annoying to read, but you don't have to get stuck on it, as it'll all make sense soon enough, don't drop the novel because of it(as some have).
The other "bad" thing about this novel, and the reason why it's score dropped a bit for me is it's inconsistent updates, and rather slow updates.. which is really understandable as he's writing the story, and not translating it I believe, and it's much more work than just reading something and writing it down in a different language.
Even so, the author's not to blame, it's just that this novel is so good that it leaves me wanting for more, checking daily until finally a new chapter is out, and so I'm trying to get some recognition for the novel by writing this review.
Try it out(you may skip the information bombs about the game workings, you'll not enjoy it any less if you find those troublesome, endure it)