The weren't Jar Jar lame but they were fucking stupid.
They were actually supposed to be wookies, but Lucas didn't think he'd get to make all 3 movies so he introduced wookies.
I personally think ROTJ should have had the rebels know there was a small colony of wookies living in the woods on moon of endor, they had fled the wookie planet when the empire took it over....kind of like our survivalists talk about 'heading to the hills' the space equivalent is 'head to some unknown moon!' and just by bad (or good) luck the empire then picks the same spot to build the deathstar II.
Rebel would have been to mimic the Green Berets. Sneak onto the moon with a dozen guys and crates of weapons and a plan to convince the locals to take up arms against the enemy. Except of course you are giving wookies blasters not Montangyards M-1 carbnes.
Would have eliminated all sorts of bad shit in that movie, like 3PO being seen as a god, rocks dropped from hang-gliders made of bark and leather...but allowed some stuff like log-traps toppling walkers as well as brute force bludgeoning attacks working okay against armored opponents.