I'm not saying DF is free of bugs, but actual bugs in it are going to be fixed, so it's easier to ignore them. If you knew your dwarves are going to get stuck now, and in a month, and whenever you want to play, would it be still fun?
I have to disagree with this. I'm definitely going to have fun with a game with a known bug that's going to be fixed in a week. It can even be a crashing bug, or making some mechanics unavailable. I'm just going to avoid that area, because the game is still evolving.
The same bug that's never going to be fixed makes the game not fun at all for me.