Just tried it out as Rohan against the AI, and have some feedback on the map itself.
-When Rohan breaks the dam, Rohan loses, which obviously isn't supposed to happen
. I think the problem is that it is set so Rohan is destoryed when the Dam is broke instead of Isengard.
-The Tower of Orthanc has a lot of health, but isn't invincible. I suggest making it either a lot easier to destory, or make it unable to be destroyed.
-While I haven't played this against a human player, I suspect that the Treasure chests will break the balance of this map. Both factions pretty much need that money to Kick Start their economy, and because Rohan has access to the Exile Camp, they will pretty much always get the gold first. I suggest changing the gold into Hero Level ups, as well as adding some Creeps defending the Areas. That way, both factions would have an equal chance of getting to it first, but it is more of a risk because you need a hero to get it, and it will take the hero out of the main fight for a little. Though I wouldn't add Troll Lairs, otherwise people will grind them for Experience.
- I suggest adding the "Isengard Orcs" to the Orc camp. Because Grishnak is there, it would make sense for the Isengard Orcs to be there too.
- I strongly suggest that you make Gimli run faster. In both this map and the Eriador map you made, Gimli is annoyingly slow compared to every other hero. So if you know how to make him as fast as the other heroes, that would be great.
- For a Forest, Fangorn seems to not have too many trees. Adding some more would make it look more like a forest.
- Lastly, I would like to see an edited spellbook for the Map. It was amazing how it worked in the Eriador in my opinion, and I would like to see something similar come back.
Other then that, the map is great. I really like the map, especially visually. Keep up the good work.
EDIT: Seems like my game just bugged out the first time because Fangorn Forest has a lot of Trees on my second attempt. Sorry about that