It's funny, I love a banged tail when it almost brushes the ground, almost like a beautiful skirt, but I hate shorter banged tails. They look like old prints of racehorses...okay if you're hanging on the wall, but not for real life.
But back to the topic...this is another case where it depends on the horse and how the tail affects the overall balanced look. I love a long, full, cascading tail, but some can be overwhelmed by too much of a good thing. Then there's Mingus, who could pull off a real whopper of a tail, but instead has just a very average tail...sigh...