For me, I just felt the characters weren't acting like themselves, and were doing things they wouldn't.
The magic addiction thing was too preachy for me. Like, Yeah, yeah, drugs are bad, we know, we know. Can we move on to a different subplot please?
Remember Xander's brilliant speech about love and loss to Buffy while Riley was on his way to the Black Helicopter in S4? And his subsequent beautiful
declaration of his feelings to Anya? I can NOT believe that's the same guy who left his bride at the altar, and doing so ruined that previous beautiful moment for me.