I did all the war-bands the other day, they're balanced. most raid war-bands require 2+ players (not including Bethan and Bugud who are too weak). In fact, they should require 6+ players.
Something that turbine might consider is nerfing all war-bands down to solo size when a region becomes old content.
LvL 100s: Beorning, Burglar, Captain, Champ, Guardian, Hunter, Lore-Master, Minstrel, Rune-Keeper
LvL 85: Warden, Minstrel
All my forum posts are my opinions and may not even be that. Also On Twitter: @leixicon