Caius was an alright villain. He didn't have an annoying voice (Seymour), he wasn't absent for almost all of the game (Ultimecia), he had a good motive/purpose for being against you... but I couldn't help but feel that he wasn't really that evil. There was never a point that I felt that he was dangerous, never a point that I felt he wanted me to die, never a point that I felt he was out to destroy the world. Which takes a lot of the 'fear factor' out of him, and makes him more like a rival than a villain for me. He was alright, though, as I said earlier - not bad, just not epic.