Oh yes, there are some eps beyond Billy that I love (WITW being one of them) but as far as the overall arc of the show, that's where I think it veered off course. I really liked Birthday, too, although that was another one they retrofitted into the Jasmine plot line. The idea of Cordy making that kind of sacrifice really showed the importance of her journey. The problem was they never really explored it properly after that, she seemed just the same apart from the odd glowing and floating. I thought there would have been more by way of the negative effects on a human transitioning to a demon, but it was kind of glossed over.