Thanks for posting that up guys. I think a lot of those costs are high, Theskinnyhobit, and some much too low. Just IMO etc. I have tried to organise this by bands/tiers. Some things look 'good' in this game, but the opportunity cost is always more troops. Additionally, the more expensive a hero-caster, the more vulnerable to being dueled out by multiples of cheaper heros.
1. The way you have ranked Wraiths appears a little inconsistant to me. I would have said the Witchking's price was right compared to the costs of the various Istari, a standard Ringwraith is good at 150ish (compare to Radagast, Gandalf and Galadriel) and then the nasty (Betrayer, Khamul, Knight of Umbar) Ringwraiths are somewhere in the low-mid 200s. Anymore is just out of the bounds of how Epics are handled in this game and only one might for the ES is a genuine weakness when you are talking multiples of duelers to counter them.
2. Unit casters should not go below 75pts, probably 80-90 is reasonable given the potential. Dismay has transfix and Ruin has either Shatter shields (probably doubles casualties from the front) or something to nail a monster, darkness has wings of terror. 100pts was too much (except, I agree, for darkness, given the spam potential), but if it goes too much lower I'd say these would get taken all the time. They allow you to double, raise courage by one (evil is short on inspiring leader) and give an exceedingly useful spell each.
3. Durburz, just IMO but there is merit I think in a band that is 125points ish, has 4 might, a couple of abilities and Inspiring leader. Faramir would also fit right in there.
4. Druzhag, again he is like the top tier Ringwraiths. He has to be expensive, since his ability allows so much. Only mastery two though, and no 100% 'get out of duel' card. Depends on how you play Epic Cowardice, looks to me like it is "at start of phase", so goes in a queue, and thus is 50%? Would have him at 175 pts -comparable to the Istari.
5. On the minors: IMO Captains are worth it for their points. The only bad thing about them is that they are not good in cav IMO, for reasons of duels/combat resolution. Banners should be 15pt for inf and 25pt for cav. Hornblowers, not below 10pts IMO.
This is suggestive that a Gondor list might be helpful?
I think that Hashut blessing's intention was to post his own list and get feedback though.
(edit) If anything, I think Amdur is currently over-costed btw. He is similar to the heroes I think are in the 125 pt band, but has the excellent and dangerous combination of Epic Duel and Epic Strike. On the other hand, still only three might. That tends to fatally cripple him IME. One big hit in terms of a fight between formations, a duel and then some other modified roll, and he is done. I think 150pts is more like it for him.