The premise here is that we're player avatars in an MMO and that, over time, we've gained sentience if not an actual understanding of who and what we are. There are further issues at play, as revealed in one ending: it would seem that this has been going on for far longer than we think, and over the decades our world has ceased to be an MMO and become, instead, a sort of pocket reality.
It's an interesting and fascinating premise, but I think that not enough has been done with it. The whole thing seems to boil down to one branch fairly late in the game, and there doesn't appear to be much deviation in the path that leads there. It generally seems that our choices do not offer much variety in experiences. There are a lot of questions left unanswered. On the whole, it seems to me that the game packs far too much story in the front, and leaves too little game in the back. It feels a little truncated as a result.
The writing is fair enough. The described experiences of living in an MMO, one focussed on raids against other player groups, seems to correspond with everything I've heard of such games. No doubt someone more familiar with these things would relate more, but I don't know that this relation with personal experience would actually add a lot more: the game does a pretty good job of conveying them without dependance on exterior knowledge.
Raisin bran cereal and milk. It's a little one-note, but not without a few tasty nuggets mixed in.