I'd like to blame George Lucas for my opinion, regardless of how ill-informed it may be, when it comes to a particular Hollywood trope.
Somehow a bunch of neolithic people are capable of overcoming overwhelming odds because they're full of the spirit of nature which will always triumph over evil because it's a crowd pleaser. Facing off with mecha, aircraft and automatic weapons while wielding bamboo spears tempered in fire and wearing bark armor will unequivocally win the day.
No.
If it really was something along the lines of constantly raiding civilian settlements, slaughtering them to the last regardless of gender or age and then finally taking out everyone else in the same fashion western expansionists 'pacified' Amerinds with smallpox infested blankets then I could buy into that plot.
Ever since Return of the Jedi, to the best of my recollection gentle reader (and do feel obliged to prove me wrong via email), I've seen this bunches of times and died a little inside in each instance.
As long as I have the memory I will be content.