The Cole story arc
Had the potential to be really good, but I had a few issues with it. First, they played their cards way too soon. Cole being revealed as a demon, Cole and Phoebe falling in love, Cole being (not) vanquished, Cole returning, Cole and Phoebe resuming their relationship, Cole turning evil again. His storyline could easily have been been spread over 2 seasons. Once Cole returned halfway in the season, it seemed they weren't sure what to do with him. Also, Phoebe turned really unlikeable. She was obsessed and it was already bad enough she kept lying and hiding things from her sisters, but she also had a huge chip on her shoulder about it. Even after Cole had returned and her sisters were pretty accepting of him.
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