In my experience, and the experience of every investor I know, is that property managers do not give a crap about your property. They will put any warm body in a property because that's how they make money.
Actually, that's how you lose money. Crap tenants don't pay rent, and then you spend time chasing the rent down, going to eviction proceedings, and still never getting your money. Then you have to put your efforts towards putting a new tenant in the property, and you don't even get paid for it, because no property management company can get away with charging a leasing fee after their procured tenant broke the lease.
What you describe are scummy bottom-feeder management companies. They are the exception, not the rule. If you screen for a good company like I suggested, nothing that you've described will be an issue.
Some of our happiest customers are investors with a large number of properties. They obviously feel differently than you do about the worth of a management company.
Do not under any circumstance go with section 8 tenants. The only way to make money with section 8 is to be a slum lord. You do not want to go there. They will destroy your property.
This is the worst advice that anyone has ever given. Section 8 tenants are wonderful. Why? Because the rent always comes, and it always comes on time. Even better, in most areas, the rent is direct deposited! Not even a check to deal with cashing. On the 1st of the month, the money just pops into your bank account. Never chasing down rent, never worrying about trying to get a tenant to pay a late fee. Never worrying about an eviction.
As long as you screen Section 8 tenants no differently than you screen any other tenants, then you'll get some fine tenants whose rent will always be paid on time.
All that being said, depending on how expensive your property is, Section 8 may not be a viable option. Each jurisdiction sets their own caps on rent assistance, and you can't legally charge a Section 8 tenant above what their voucher allows. Generally in this area, if the property is more than $1,200/mo and it doesn't have more than 4 bedrooms, then you can't rent it Section 8.