I've heard a lot of people say Appys are just mean-tempered.
Some leopard Appys can be kind of ugly, I guess. The eyes. O.o
I've worked with several Appaloosas and they've all been really nice. They were no different than QH's or any other stock breed. I don't get why people don't like them. Arabians are another story, though.
I know why lots of people don't like those.