Re: Rohan , Harad , Rhun over-powered?
Concur, I plaid Rohan variuos times, and I love them, still they don't have such a good infantry, IMO.
This thing has been discussed before too, so I think it depends mainly on players tastes and play stile.
To say that Rohan is OP is exagerated, especially compared with Harad (rich, becomes overpowered due to AI scripts and whem Mumak are on field you can say goodbuy .
) and Ruhn (really OP, both economically and military); we can say that Rohan can field an all around rooster of troops, but defintely no, their infantry in not any good compared to Ruhn or Gondor (not to speak about the Elves and the Dwarves).. Rohan can become really powerful as soon as you have a 10 star general like Theoden leading an army of full cavalry mixed up (heavy-medium + light + horse arch or javelin), you can deal with anything (was normal to win up to 5-6 main battles against Mordor and Ruhn before I actually needed to retrain some of my units), except perharps Mumak.. you "only" need to have good economy, which means you have had to chop down Isengard and Dunland (for MOS), before you can do it .. so no, they are not OP 
Flinn