I really don't care how my horse looks in terms of correct neck-set, correct head-set and stuff... I never really have cared about that. Sure, I want my horses muscled and shiny and happy... but I want them to be able to navigate a trail and that stuff more than look pretty. As long as I know that they're pretty, that's all that matters.
I do care about how well groomed they are, though...I love brushing my horses and will literally brush them for hours when the whim hits me. I'm still trying to break my obsessive brushing though... I've forced myself to ride with tangled manes and poopy coats so much that I'm beginning to just not care.
But I still like them to look nice.