I have to say, I am a huge fan of the breed. I've had the pleasure of working with some awesome appaloosas, but it's like any other breed. There are bad ones, too. I've seen ugly apps and I've seen badly behaved apps. I had a horse called Mananas Kat that was the best gamer I've ever ridden. If you didn't look at his head or his legs, he was gorgeous. But he had a long, skinny head with a Roman nose. He also had more heart than any horse I've ever ridden. And several of the farmers around here bought appaloosas as work horses because they liked what they saw when we worked together.
I've had limited experience with other breeds, but some of the QHs I've ridden I absolutely hated. Does that mean I think all QHs are worthless? No.