Spent the entire day thinking about this game. Still haven't fully come to terms with whether actually I like it or not. One thing I will say, from my experience, it achieves everything it set out to do. The whole experience feels very purposefully authored and complete in a way that a lot of games don't.
Ultimately I think a lot of discourse about Firewatch will be whether the player enjoyed the game for what it is rather than what it could have been.
I don't know... I get the sentiment, but the dialogue was often forced (which could be partially attributed to the uneasy emotional states of the characters, but felt too often to me like weak writing)... the plot doesn't quite make sense in retrospect (as observed in this thread), and there seemed to me a firm disconnect between the notion that the characters are damaged people and what you spend most of the game doing.
Looking back, I don't really appreciate the time that I spent playing the game, even taking into account the small goals that it sets out for itself. I get its prevailing metaphors, but those aren't that compelling (I find the invocation of Alzheimers emotionally cheap, to be honest), and other games have already done this sort of thing better, so it's not even novel.