I have only seen Billy's performance on charmed, one of my favourite series, but judging by his appearances there, I just can't understand how he even got a roll on the show. He is probably the worst actor I have ever seen, and all he seems to manage to do I stand and look down his nose in an over-dramatic manner. Everything he says sounds wrong and like he makes himself say it. It doesn't come natural for him.
For me it is a mystery that anyone likes him and that they brought him back on Charmed 7 times. 7 times! It's unbelievable, and I pray that he will never be back for another episode.