Hi! I see this thread is really old, but I'll play, anyways!
My first horse was an Appy mare (still have her, she's just retired to my moms' trail horse...she's 26!) She never bucked, never reared...but got me in the dirt more times than my OTTB! Appy's are SMART! When I would jump her, she would know if I was behind her 100% or not. If I was behind her, she would take a prelim XC fence backwards (true story) for me without hesitation; if I had a shadow of a doubt about a fence, she'd dump me on top of the rails of a 2'6'' fence. She taught me to trust.
I know Appy's have a 'stubborn' reputation, but I think they can all be cracked; we as human's just have to see the amazing potential.