eh, i'd argue on the "worst sith ever" front, considering you have darth "i only serve as a plot device who gets killed within minutes of introduction and looks like a devil designed by juggalos" maul, but kylo ren is not an experienced sith by any means (he hasn't even canonly finished his training) so i can see why people think that.

and yeah, sure, he looks like a horse. it doesn't stop me from liking him or his character, though, and i don't see the point in arguing whether he's pretty or not. the guy looks how he looks and someone people will like that and some people won't. besides, the character is a villain, i'm surprised people were even expecting him to look visually appealing in the first place.