Your mileage may vary, but for me, the game is transcendent.
It transcends both video games and movies to become something greater than either medium would ever be by themselves. I'm an avid gamer (I have 400+ Steam games, 400+ iOS games, and 100+ console games). Yet--to speak for myself--*I* found this game far more moving, thought-provoking, meaningful, and entertaining than many other games (including Super Mario Galaxy 1-2, Grand Theft Auto 4-5, The Last of Us, and others).
I can only compare it to Heavy Rain, The Walking Dead, or the Metal Gear Solid series: deep rich stories that have themes and messages that convey something of lasting meaning; something beyond the mindless (but fun) shooting and platforming of other titles.
I will remember this game for years to come. There are few works of fiction of any medium for which I can say the same.
If you like a rich deep story line and don't care about a lack of "agency" (it's always illusory in video games, anyway--there are always incredibly restrictive rules on game play), then this is *the* game of the seventh generation. The comparably minor errors in execution and direction can be ignored, when viewed in light of the whole.
Indeed, the question of whether this qualifies as a game is, like Dear Ester, a largely irrelevant and pedantic: It entertains. It provokes thought. It is emotionally moving. And it illustrates that games--like cinema or literature--can be taken seriously as a medium to both entertain and enlighten.
If judged solely as a film, or only as a game, I can understand the bad scores, but when you combine them, I think the effect is unique and something we need to see more of. It seems to me that most reviewers of this game have profoundly and tragically missed the point.