You have to take into consideration that Sauron chose Mordor to be his stronghold in the year 1000 of the 2nd age. so it probably wasn't so evil before he got there. in fact, it was probably like Tunisia or Morocco, only without the casbahs.
Anyhoo, after Sauron was destroyed, i'm sure that it retuned to being like Morocco (after several hundred years). And think of orcs as being like ants- annoying but bloody easy to kill if you have the right technology. so, if you gathered a large-ish bunch of Gondorian warriors, who have been killing orcs for, like, five thousand years, i'm sure you would find it pretty damn easy to wipe the buggers out.
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Nai tiruvantel, ar varyuvantel i valar tielyanna nu vilya
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