I live about 2.5 hours from Shelbyville, TN, which is the Walking horse capital of the world. I've been to the "Celebration" which is their main show of the year.
In all honesty, I really can't stand what they do to the horses. I sat with my mouth hanging open most of the night. That was back in the late 80's before they really cracked down on the really heavy hoof chains and burning/painful hoof packing.
I am sure it still goes on, but their are now strict fines and punishments if caught.
The saddlebreds are somewhat better,but, they have their issues too(like throwing firecrackers and such at them to "hype" them up for the ring to be more flashy) Again, doesn't happen all the time
You will find good and bad in all breeds. I love the Walker and Saddlebreds as a natural breed. Sound, and lots of heart