Bliz forgot why they took Scenerios away the first time, but they seem to be forgetting many things. GCD changes and macros, LFG broken addons to make WQ take longer (and to slow warmode LFG), and the UI change for Arena players with a higher scale default setting.
There are some good things also, like the new DirectX, the new art looks great especially when it's dark, and some of the music.