Finished it last night. Got to be honest, there were so many plot holes, I really lost that "suspension of disbelief" you need to remain connected to a game/story. And too much of the game seemed "sentimental" to me, by which I mean it just tried to evoke emotion without subtlety ("here is a sad part!"), without the story or the writing to back it up, which left me feeling sort of emotionally manipulated.
I admired Ellen Page's performance and the visuals. The story did have its moments, I don't want to discount it completely. It was ambitious, that's for sure. I just don't think it succeeded all that well, either as a movie or a game. 7/10 from me, with points for effort.
Which side did you choose in the end?