Firstly not to criticize but I've had bugs with it especially with the lake view property which I've yet been unable to obtain. The whole thing is much more buggy than skyrim is actually. Though except for this and some freezing the other bugs don't bother me.
Next. The houses respawn. That should not happen.
They also while very fun to build are not fun to stay around. Random spawns are fun though, what's not fun is other things.
Things that should have been in heathfire:
Auto placed weapons and non respawning houses
Adoption adding was probably intended to be in the original skyrim game. I liked how bethesda added other things to this even if they were buggy. Sorry if that didn't make sense.