Well, he has demonic blood in him, what do you expect?
Personally, I've only used him once, and then only briefly. The Blade kit isn't very strong unless you want a rather inferior fighter. I would have preferred a Skald for the increased bardsong. His spellcasting is no picnic, either. Oh, well..I *have* heard that he does get better if you get to ToB with him, though.
-Sazerac