If you ever read any of his interviews over the years, he has always come off as a pompous ass. See the last on Metal-Rules which caused a tiny stir in the 'Thrax camp. He also seems to be a friggin' hypocrite. He claims to be born again but at the same time pimps photos of his hot wife on his web site.
When I saw them open for Priest not long ago, he looked out of place on stage. He seemed to be doing his own thing while the rest of the band did theirs. While Belladonna's voice may not be in top shape anymore, at least his performance acknowledged the presence of the other band members. Plus, he was not even on stage for the entire set. I would have guessed that he had some equipment problems but I have read from other boards, that he did this at other shows as well.
Not that he is the only one in metal that is a pompous ass, but he just comes off quite fake to me.