Free-Orc Spam is the main early movement of mordor, do other thing will decrease your possibilities to win, the orcs only are usefull in very early game, without any tipe of support ( Cirith Ungol/Trolls/Gothmog/Nazgul/Archers) Their are useless in mid game, and you will loose. Also you cant get all of these things because you havent got enough money and also, you have to get an outpost in mid-late game, or you will loose.
So, not easy tactic, and also you must use properly the buffs ( Eye of Sauron/ Tainted Land) Or you will have a bad early game.