I know what you mean. When I was looking for childcare, I would watch the group of childminders so I'd know who NOT to use.
Luckily, I found a lovely one.
I later became a childminder myself and behaved on the basis that I knew exactly how it felt to leave your child in childcare and so I always cared for those children as if they were my own. In fact, I took even more care of them. On the surface, I probably didn't look like a childminder as I made sure I kept a small setting.
I steered well clear of those childminders breaking the rule of "in sight and/or hearing at ALL times" and kept myself to myself.
I couldn't believe how many of them would let very young toddlers go off on the soft play out of sight by themselves. I watched mine like a bloody hawk! I could never forgive myself if I lost a child.
My advice is to look out for the good ones.
Nurseries are awful. We lasted 3 days with one (spotted some appalling stuff on CCTV) and that was after looking around about 10 of them. What I saw there made me cry. I have two friends who worked in nurseries when they were younger and both said they would never, ever put their own child in a nursery.