My downfall with haven was a pretty slow agonized thing. Basically there comes a point when the game seems more like chores and less like fun, and then you see a stranger nearby and all those chores are suddenly threatened. Your friends stop showing up or they won't help out with certain things (making steel) and everything seems to become a task you do by yourself. The game is fun alone, but gets boring quick if you dislike repetition. Playing with others is much better, but you better be sure those you are playing with are your friends/can be trusted. Recruiting new villagers can lead to a swift and disheartening downfall if you aren't careful. School made me distrust people, H&H tripled those feelings.
I still love it.
A lot of the tedium is being mitigated in this new version apparently.