Video game worlds to me are just cop out settings to appeal to a broader audience and create "easier" plots by taking elements from an already existing medium. It's boring because there's no originality. In every single one, there's always going to different overworlds, leveling up, putting items in the inventory, so on and so forth. Every single thing from major settings to the little things is from a video game to the point where you feel kind of numb to everything that happens. The development of each character also becomes insanely boring and monotone. Oh, you want to improve? You fucking grind and level-up. No, you don't improve like every other action story where you use your own abilities and creative prowess to combat the enemy. No, you grind, level up and sometimes you learn a god damn new skill, and then voila now you can beat the enemy! It's systematic and a load of shit. Many elements become determined simply on levels, equipment, or skills. It's a shallow and lazy way of comparing the abilities of different characters and it hinders the plot substantially. There's no thrill involved because it no longer feels like the protagonist is special and improves on his own ability via his own training and creativity, it's now controlled by a third, outside element that does the training for him. Not to mention the powers themselves also lack any semblance of creativity too, because they also have to be based off of some fantasy WoW bullshit. Reading video game mangas feels like I'm watching the most boring, stereotypical JRPG cutscene for hours with no playtime. This terrible, awful element mixed with the stereotypical shounen plotlines and/or fanservice characters that you always have makes it even worse to read.
That's actually pretty funny, because Kirito does nothing of the sort and that is almost the common complaint about the series, is that he's just SuddenlyAwesome, doing things you could never actually do in an MMO (like taking on a highlevel mob by yourself) and we're suppose to eat that shit up.
The Video Game World. Is a framing device. And if you are reading it for consistency and expecting some godsend transcendent piece of art, then don't cop out the plot just because of how it's built. Blame the plot not the means by which it is being told.
Examples of awesome plots with Video Game Settings: Assassin's Creed and Tron