My girlfriend is on the HOA board for the neighborhood and having listened to many conversations, I am fairly certain I know why so many go to shit.
It's not the rules or anything like that. It's boredom.
The longer an HOA member serves on the board, the less willing they are to make efforts to do things like, get a better bid on landscaping, or deal with a tenants legitimate complaints.
My GF is constantly arguing for the other members to do their job. It's ridiculous.