I like Cordy's arc - her changes are there even though they're small. I like the way she told Buffy to lose the tude - spank her inner moppet. Yeah, she was a mean girl to start with but that mean streak got tempered by reality. Her parents lost all their money, her father ended up in jail, her acting kinda sucked. I think she missed having purpose, and that's why she hitched herself to Angel.