AT12 only had one impact on me and that was "flashy". It's like seeing glitter and diamonds and those light! I personally thought it was very enjoyable, but definitely not something that I would re-watch, or I'll just watch it only when I want something entertaining. Unlike AT10, there weren't that much of memorable performances, but overall I don't have much hatred toward it.
On another note, I found this page from Popteen 2013.11 issue, I was surprised to see 2001 Ayu pics in the bottom, does anyone know what it said!