There are certain unwritten contracts between the consumer and creators of a story. If the creator says the story is of the mystery genre, that means it will mostly follow said genre's conventions. If the creator is going to break said contract then they have to earn it, and if they don't, should be criticized for it. Of course opinion will play into that, but general guidlines for quality still exist.
I think the real problem here, is selling a story as a mystery when it is not. Both Firewatch and Lost were sold on their mysteries (this is often mostly the publishers fault than the creator's, but it varies.) In the case of other genres it's easier to review. If something is sold as action or romance, you can just state the genre conventions that weren't actually there. In the case of a mystery, it is more difficult, since explaining the mystery in the review and why it does or doesn't work could negate the need to consume the product all together.
A story can earn a dissapointing, sad or contradictory ending, but explaining such in a review is really difficult without spoiling that that's the case. And sometimes products are made or sold to that end in an attempt to avoid or bypass the process of criticism before they have your money, (after that they don't care.)
::I haven't played Firewatch so this isn't meant as a view on it's ending::
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