When bemoaning how landlords are awful, it's worth considering why they ended up that way. I don't think most tenants (who are 95% OK) understand how bad the worst 5%, and how much time and energy landlords have to dedicate to dealing with the worst tenants. It's a class of person you just don't have to deal with in your day-to-day life.
It's not the 80/20 rule, it's the 95/5 rule.