I dunno, he doesn't look that bad. I knew he would look kinda draconian, but I do like the twist they took on him, making him into a chimera dragon. His voice is pretty good too, tough I do still think it's a shame they didn't get Tim Curry (HE WOULD HAVE BEEN PERFECT!)
I will admit, he does seem like a bit of a step down from Nightmare Moon, but let's face it: How could you honestly top her?! We have to remember, regardless of the fanbase, this is still a kids' show.
Also, we must remember that this is only a 1 minute clip, from an hour long 2-parter. Remember what Zecora said "Maybe next time you'll take a closer look/ and not judge the cover of the book".