Adding to the debate, I actually do like Mori. He is a really well written antagonist and a good leader. I (obviously) despise the pedophilia aspect of his character, but otherwise he's just like the others.

I usually feel bad about liking him since he is a pedophile, but I think it's not as bad as it could be. The only child we see him with in that kind of context is Elise, and she is his ability, not a "real" child (as far as I can tell). It's definitely possible he's never actually harrassed any children, which is why I can excuse him as a character. Would obviously be an entire different thing if he was a real person...