Ugly is in the eye of the beholder. As long as I can get a good sound out of it then, for me, any instrument is up for consideration.
On the other hand, head stocks I don't rate are the Kubicki Factor 5, or the extended B string design that Fodera occasionally use and for practical reasons the nice looking angled back Gibson head stocks are a bad design. If the best sounding bass in the world was the ugliest and I could afford it, I'm sure I'd own at least one.