Yep. This has been my experience too. I am sure there are some good ones too.Some of the worst coaches I have seen were former D1 players. I see teams advertise this all of the time, coached by former college player that played at so and so.
You are just rolling the dice there in what you will get.
At least he dad coached teams are vested in the teams success. Hired college coaches that are there for the summer can be a circus.
Just my observations...