Ok. I loved the intros. Hated the outfit / hair.
Now, If you didn't like most of CG/TD/Fw... you can't like any Katy performance. That's HER voice. That's how it sounded back in the KH days, pre-OOTB and some songs during/after OOTB. She doesn't have to improve (at least during those songs) because that's actually how she sounds. IKAG/PoM were very solid too.
DH was really bad (the "Make Your Aphroditte" / "It's a yes or a no no Maybe"

), she CAN'T sing WA's chorus. And Roar was average (don't like the concept so I really didn't pay attention)
But she actually deserves the dragging, it's her own fault for letting Dr Luke (& Co.) process her voice SO much that people actually expect something else.