Seems simple enough but how do you guys deal with a harad bowline or easterling pike blocks or even a swarm of corsairs with reavers mixed in? Oh and sometimes they're all in the same army if anyone has any recommendations for that... and Nazgul are almost always present also...

With what force?
With Rohan I'd take lots of Rohirrim. With Dwarves I would bring Rangers to give you some bow-fire and a good mix of Khazad Guard and Dwarf Warriors with shield to soak the fire. Goblins need to use fury bubbles and swarms.

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Any forces, our gaming group has access to most and yes rohirrim are necessary in swarms but even then it's still hard to crack an easterlings defence or advance at a haradrim bowline without being torn to shreds :/ Dwarf rangers are quite costly and although I love the model and they always perform well I find their bow strength 2 a let down against harder shelled opponents although I guess against the haradrim and corsairs they'd be pretty useful. Oh and I do love a good goblin fury bubble :p Cheers

Ok well then

Mordor- Bring Orcs to soak up the bow-fire and then have trolls and heavy hitters to do amazing damage to those low defense models.

Isengard- can bring crossbows behind armored and shielded Uruks to kill the enemy archers.

Gondor- can huddle together in a heavy infantry formation to survive well and counter with Rangers and heavy archers (warriors of MT with bow or Citadel Guard).

Elves- will struggle the most (outside of High Elves) simply because you cannot boost your defense enough IMO, but if you have elven cloaks you can snipe the Harad archers.

Basically high defense models that are expendable are your best defense against Harad archers

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A lovely mix of tactics there cheers

when I played against harad last month, I used some SKoDA to make a gap in their lines, and shot pretty some of them down with blackroot vale. with the mass kills from my knights, and after cleaning up stuff with axeman, I was able to break their force, after that it goes fast with harad.....