With rare exception I found the TNG era Klingons to be largely one-note. Thee JJ style Klingons are not an improvement.
Do you mean to suggest that the TOS era Klingons
weren't largely one-note?!?
Of course they were, but there was a reason for that. All the TOS Klingons we saw were soldiers. We only saw these Klingons in direct confrontation and contact with Starfleet/Federation officers, with whom they were battling in a cold war. This would be the same as if the only time we ever saw Soviet sailors and soldiers when they were in direct contact with NATO forces during the 60s. Of course we're only going to see their patriotic soldering military side. We were never exposed to Klingon home life (except Kang and Mara), social customs, sports, music, etc...
In contrast, TNG, DS9, VOY and, to some extent, ENT gave us civilian Klingons. We saw their home lives, heard their poetry, opera, food, music, dramas, etc... We saw more of Klingon life than just patriotic soldiers trying to outbluster their "sworn enemy."
Yet, despite all of that development, the Klingons still remained a one-note culture. All they talked about was fighting, battles, honor, etc... Even the Klingon accordion player on DS-9 had a battle-ready accordion. Everything always came down to honor, violence, fighting, blades, etc...