
I don't think I've been so involved in a game before. I don't get overly excited during actions games, I don't really get emotional during most story-driven games, but I can admit my heart was pounding at times. I love how the game forces you to make physical actions. I tended to not notice so much during the actions, but afterwards I often found myself feeling a little like the character would have felt (I could feel my muscles had been working, for example). If you get it, you'll see what I mean.
Regarding the way the story works, this takes the replay value of Mass Effect 2 and shits all over it. As a test I did play a single chapter differently and was treated to entire scenes that I wouldn't have seen, and big plot developments. The best thing is that you never feel like you've done something wrong. Actually, it often feels wrong, due to what the decisions often are, but what I mean is that you don't make a decision and then really fuck the game up. No matter what you do, the game continues. Get a main character killed? The game continues. Kill all the main characters? The game continues. And while you're playing it, they've set everything up so it really feels like one solid story where what you've just caused was meant to happen. You do sometimes regret decisions, and wonder if it was the best idea, in the same way that you would worry if it was the best idea if you had made the decision yourself in real life. The game is really designed to tug at your morals and emotions. You have some pretty horrible things to consider.