MOrdor is not overpowered and it is slightly underpowered ( at new mordor got nerf on heroes and fortresses by increasing their cost ;so it is hard to obtain advanced orcs or heroes comparing to gondor,rohan and isengard right now; so if you don't reach fortresses on time your army becomes very weak for after mid game ).
Some people say free orcs issue. I must say this very clearly really. Free orcs' spawn time is very long and they are very weak. Even you send a zerg of them rohan,gondor and isengard can encounter them very easily. It is the truth !!! If rohan,gondor or isengard reaches to their upgraded units ,even a zerg army of free orcs or fortress ( minas morgul or dol guldur ) orcs they are getting defeated at the end on the battlefield then it is really hard to stop the other side.
For trolls, trolls are getting die vet easily even thy are in upgrades versions. Trolls' anti-units are archers and spears and your trolls are dying so fast or heroes like rohan's hero Éowyn's spear attack takes 3/4 hp of the troll with 1 hit !!!
MOrdor's main problem is this : " when you concentrate on one thing you lose others and these others remain as very costly ". Mordor gets it main power from settlements first then sauron influence. How ? Settlements lower your orc unit costs or lower your trolls or spiders' costs . Thus, if you go slave camp which you need to have 6 slave camps to reach its maximum potential which is prefered to have x6 settlements to get its maximum effect ;otherwise it is not very effective, especially for end game ( at end game you need to spawn your orcs so much and faster to defend yourself ;otherwise your lose is definite !!! ). Shortly, when you go one of mordor's power you lose from others. It is same for siege weapons or spellbook effectiveness too. If you don't go for x6 armory then your siege weapons are too expensive, if you don't go x6merchanary then you cannot obtain your cool spellbook skills which affets your gameplay and the situation of battlefield too much.
The maps of edain mod 4.0 demo, there are very less settlements for mordor to use. It is not a problem for other factions too much. Mordor power is getting its power from settlements shortly. However, even Edain Team puts enough settlements and big camps it will not change the fact " MORDOR IS SLIGHTLY UNDER-POWERED ( comparing to other factions ) ". Why ? because of upgrade system of other factions and their units are better than mordors in general and they reach many things faster than mordor !!! Mordor cannot do anything against fully upgraded rohan,gondor,isengard armies and if it is a player too then mordor doesn't have any chance at all !!! We have seen at EDAIN TEAM'S TWITCH MATCHES that how the good factions are very strong against against evil, especially against mordor ( isengard is really good comparing to mordor , it is the truth ).
If I wrote something wrong please say. But I want to say one thing I am playing against Brutal AI good factions+isengard vs myself as mordor always at 2 vs 3 or 4 vs 4 for hardcore,difficult gameplay and mordor is losing most of times ( and I played many many matches against Brutal AI at 3vs3 and 4vs4 )...
Mordor AI is useless too in the demo or mordor with a real person - still mordor is very weak at the lan games )
Other problem is " Good factions' castle and camp walls are very weak ( it is really easy to destroy them, me and many ppl think like me have same opinion that we don2t get the siege feeling really. Make Good factions' castle and camp walls more durable and more health. In addition, make castle maps for 3 vs 3 and 4 vs 4 too please !!! Thanks.
Note :
Please check my mordor suggestion post :
http://forum.modding-union.com/index.php/topic,30590.0.htmlThank you.