In my opnion, right now Dunedain, intended as a trait-based mechanic, are not good, not even for multiplayer.
However, an effect like Descendant of Kings is exactly what they need to be effective, since it does not just trigger off engaging enemies, it helps a deck actually dealing with the engaged enemies and does so scaling with the number you have engaged.
I say let's wait before judging Dunedain: a few cards like Descendant of Kings and they might well become a poweful trait.
Edited by Eu8L1ch