My mother lives in one.
I think it must totally depend on each individual community.
Hers is not something I think is good for the long run.
The houses, like duplexes, they are responsible for everything inside just like a house, and also the shrubs or flowers right next to their house.
I see no difference between this and a strict homeowners association. And they have a very strict committee to what you can and can't do-no bird houses, no young grandchildren staying for more than so many days, only very small dogs.
They have many groups you can join, and club houses where many activities, movies etc go on.
The apartments there might be more group friendly because if single, the houses can be lonely day to day.
But the small strip of stores including the grocery store is awful and the parking lot has no place to leave your basket so they have to walk it back and then back up a hill!
I know some who are very happy where they are in the 55 and older.
I guess it is like any neighborhood, it all depends on that community.
"If you walk the footsteps of a stranger, you'll learn things you never knew. Can you sing with all the voices of the mountains? can you paint with all the colors of the wind?"