When I read Elantris, one of my biggest problems with it was Shu-Dereth. Sanderson wanted to portray it as a religion of evil, which would be fine, except he forgot to actually make it a religion of evil. Throughout the book, I was constantly thinking "Okay, when am I gonna get a reason to actually dislike Shu-Dereth", and it never came until the end of the book. Even Fjordell as a whole, I didn't really dislike going through the book, because I didn't see many reasons TO dislike it. Everything that it did to try and make me dislike Fjordell or Shu-Dereth just made me hate Wyrn as an individual, instead of the whole. Yes, they destroyed Duladel, but I still never saw the religion as being evil. The fact that we only see two real practitioners of Shu-Dereth (At least that I can recall), one of them being probably the most likeable and charismatic character in Elantris, and the other being noted by the former to be absolutely insane, doesn't really help that. I dunno, I just feel like he could have done more to try and make me see Shu-Dereth as evil.