The story gets a few points for the basic idea and for being so long; nothing added to that though. What follows is a small portion of the problems with the novel.
Again, the series has a fun idea. But that's about it. It doesn't improve over time, instead piling more mistakes to the hill each chapter and rarely trying to fix what's bad and wrong. Partially successful ideas are reused endlessly, seldom trying anything new. The story doesn't even stick with its RPG elements very well. Ignoring missions and related things: stats, leveling, skills, and gold lose whatever value they once had, and not for the usual reasons. The author just doesn't try.
Translation quality aside, the author isn't an effective writer at all and doesn't express ideas well. And the foundation of the story is absolutely full of enormous holes. For just one example: time passes four times slower in the virtual world, so people live four times longer while they're in it. And that's not used logically or taken advantage of by anyone; no people enjoying much longer lives, no classes taking place there, no companies getting a huge edge over others, nothing like that, though benefits would far outweigh the costs.
There are also very annoying things. As powerdown put it, Sudden Girlfriend Appearance. Numerous beautiful and/or famous women have circled around the protagonist. Most females have little thought put into them for their debut, and later they become very attractive; or they are 'love' interests from the beginning, decided by an author who seems to have no idea what love is. On another note, the protagonist is terribly written. It's not that he's an antihero; he started out as a potentially interesting one, with awesome if bland determination, a history and perspective that induced musing, and a potential purpose that could have been interesting or at least consistent. Instead the purpose becomes murky and he increasingly ignores logic; since he doesn't even have much empathy, there's little left. As part of that, he'll spend great amounts of money on risky endeavors but pinches pennies. Instead of complaining and bargaining, he could instead agree and leave sooner, then increase his money, inventory, experience, and reputation in that time. He fails at providing a refreshing viewpoint. His potential complexity never arrived at intriguing dissonance, instead falling into the underworld of failed characters. His holes aren't intended, he simply isn't well constructed, and the same applies to the larger story.
Characters, plot, writing skill and effort: everything's terrible.