You must ask, why such hatred for putrid characters? You know, I actually think the Nazguls were kindda cool on their horses and winged dragons. Nagzul were once men, great kings of men who were blinded by their greed and fell into darkness. Poor chaps.
BUT, the worst kind of villains of our Lord of Ring world must be the Urukhai and Grinah. Their faces (and characters) were so hideous that I put their Lego versions here instead.