I wouldn't go so far as to say that I hated Dilaf, I've just never been a fan of the fanatical devotion trope, it makes me a bit uncomfortable honestly. I am too logic-minded to relate to it. In characters like Spook (toward Kelsier), Yomen (toward TLR), etc. it was more subtle so it didn't bother me so much, Dilaf was almost egregious in his fanatical hatred of Elantris and it bothered me.
As you can probably guess from this, Hrathen on the other hand, is one of my favorites