Whether Prue, Piper, and Phoebe were under Andras' spell or not, it is good to have them fighting against each other every once in a while. Sure, they have their tiny little disagreements in just about every episode, but by having the sisters inflicted with rage, we as the viewers were able to see some of the underlying issues that plague the charmed ones and everything is out on the table. Between jealousy, underappreciation, and problems-or rather people-from their past, this episode was very revealing in the sense that it brought up the sore issues and gave us more insight into the problems that all three have but none will ever talk about. This episode was a great mix of magical and sisterly problems, as well as the battle raging inside of Cole/Belthazor in deciding if he wants to kill or be killed.
I love this show and this episode is the perfect example why.