Really interesting post and suggestions, Le Sournois!
I also like playing a lot with Ring Heroes, and even though balancing should not be the biggest concern about them compared, for example, to a fun, original and lore-accurate design, ignoring balancing just make the Ring Heroes boring and unusable.
- Boromir: I fully agree with your suggestion
- Gandalf the Corrupted: I'd suggest a small movement speed and armor buff to make him more viable; he doesn't perform well compared to other Ring Heroes
- Gandalf the Challenge Master: I think he is perfect considering lore and balancing aspects
- Theoden and Elrond: agreed
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Saruman: for me, he has always been the biggest problem concerning balance of Ring Heroes; an insane leadership, which I feel that is not even that fitting, for a faction that surely doesn't need it (possibly has the strongest army in late game) + strong AOE regular attacks that may even knock back heroes, which are the realible tools that you would need to try killing him; I am not even gonna talk about his powerfull spells
I don't know if the nerfs you suggested would be enough or would be the best solution, but surely something has to be done; playing against him is not fun at all, and with him is absolutely broken
- Sauron: I feel like making a level requirement would just not fit logically; I would not change him, to be honest; yes, he is definitely very strong, but he is Sauron afterall, and yes, he is an easier hero to purchase, but he is the most canonically accurate Ring Hero, isn't he? Sauron getting the Ring always seem alright and a good challenge to me in a match, and due to his slow movement speed, he can quite often be defeated (differently to Saruman with the Ring)
- Smaug: it's design overall isn't that great to me, but I have no suggestion to improve it; I agree that the flames are not that good, and the friendly fire is really bad indeed