I like panto villains - in the right film - I just didn't think that a panto villain had any place in a story as grim as SOTL.
For me my favourite panto villain is Alan Rickman's Sheriff of Nottingham in RH:POT!
I don't think he was a panto villain in SOTL. He still scares the crap out of me, but he can also make me laugh. I like that in a villain. It's why I enjoy Sherlock's version of Moriarty so much. You can't really get more OTT than that.
Prince of Thieves is one of my favourite movies. Alan plays a brilliant baddie.
One of my favourite OTT villains has to be the Kurgan from Highlander. I think he's hilarious, but I wouldn't want to cross him in a dark alley.