I love the amount of "heart" they have, at least the ones I've known (including my own). They'll put so much effort into doing what's asked of them.
My little black horse is not a dead-head that just pokes along on the trail; he's very aware of his surroundings, sure-footed and responsive. He can pick his way through the "goat trail" areas and then move out comfortably when the footing allows it.
He likes just "hanging out" with people, but without being "in your face" or pushy or mugging people for treats.
"Parelli horsemanship is just like painting by the numbers. You need absolutely no skill. You just put this color here and this color there, and when you're done, you have ... a mess no one wants." mp