Very boring, a true walking simulator.
You can do nothing but walk and walk; there are no enigmas or riddles (I expected that), and basically you walk on a closed and forced path that eventually leads you to the end. The plot is pretty sad and surely not entertaining, even though the voice acting is as remarkable as the visuals and the music.
I would recommend it to... none. There are games that try to create emotions, as Dear Esther does, without being this dramatic, sad and generally unappealing.
I wish there was more other than the melancholic voice of a hopeless character in this game; I reached the end in an hour, and I didn't enjoy it. The replayability is absent, except of course if you want to go through the game again.
Final Rating: 4/10
Dear Esther fails hard bringing emotions and a fresh breath among the first person adventures. Recommended only to game reviewers and developers. Definitely boring and not entertaining for the gamers.