Duskwood, Stranglethorn, Badlands, Western Plaguelands, Wetlands, Desolace, Feralas, Un'goro Crater, Winterspring, Elwynn Forest, Silverpine Forest, Dun Morogh and Swamp of Sorrows.
It depends upon the zone, e.g. most of the zones were turned into theme parks with linear progression (barf), but some of the zones received a needed update (Desolace).
Blasted Lands maybe. Prefer pre cata zones for the most part.