Just finished it. Didn't see the ending coming at all. It was a good game, but one that has zero replay value to me. The variety was in the narrative and enviroment design, not in gameplay. It's a solid 4/5 experience to me, with a little less linear approach to gameplay and more variety it could've been perfect.
The story itself was merely a collection of zombie movie tropes, but it was well executed and acted. Nothing really surprised me or shocked me, I was expecting a lot more on this front because of the hype, but it just reminds me that game journos are such incompetent folk.