For now Mordor already gets a lot of awsome units, especially Morgul and Dol Guldur units, however, the current recruitment system makes them not very approachable. I understand they are more powerful than regular units but they deserve more appearance in the game. I recall in 3.8.1 we could build Morgul and Dol Guldur building to enable regular orcs pits to produce enhanced orcs from these two fortress, I kind of miss these features.
Morgul and Dol Guldur orcs should be both massive units instead of elite units, but for now they can only appear in the late game, and cannot be produced massively. Witchking and Khamul require 7500 and 6600 units to get their final forms(consider both the price of fortress and their upgrades), which are too expensive in my opinions.
I am thinking maybe it is possible to make different Citadels for Mordor(Barad Dur type, Minas Morgul type and Dol Guldur type), players could choose one from these three settlements to start with, in the later two types of Citadel players could produce stronger orcs and recruit Witchking and Khamul from early game, but also have some restriction(which I have no good idea yet, maybe no free orcs or cann't build siege work)
Anyone has similar feelings? I am looking forward to more ideas. Since I really find for now Mordor has more than enough diversity of units(enough for two factions) but not very satisfying recruitment system