Everyone's right: you answered your own question. Besides, for every 'rat' that you see (snatching, grabbing, etc.), there are 50 that you DON'T see (how do the teachers act when you're NOT there?)
If it's not too much further for you, take a look at Little Farmers in Farmersville. I was VERY impressed with this facility when I visited there.
BTW, IMO, it's not inappropriate for a 3YO to potty with the door open. Gender identification/differentiation is just starting at this point, and the kids don't think much about it. It also enables a teacher to be a bit more aware of what's going on in the bathroom and the classroom at the same time.