Basically you are correct. Except in the Roadwarrior there was a basic plot you could follow. This movie was just one long chase scene from beginning to end.
Give the people what they what --- That's a Kinks song. I would have done the same. Do some audiencae focus groups and see what they liked best in the MadMax/Road Warrior movies. They would translate into the chase scene and the great thing about such over the top chase scenes is they they can make billions world wide without any sub-titles neeed
...one long chase.....
So was Apocalypto and that movie rocked.