A movie that good doesn't need a plot!
It has one though. Furiosa smuggles the harem out of the citadel. She then turns left, and Immortal Joe figures out his wimmen are gone, so he gathers the army and goes to get them back. Furiosa manages to evade them. Second half. But then they get to the safe harbor they were trying to reach and come to find that it's been obliterated years ago. Such is post-apoc life. Out here everything hurts. They briefly consider wandering in the desert like Moses searching for the promised land when Max does the only consequential thing he does in the story and convinces them, "Fuck that." So they turn back around, kill immortal joe, and return to the citadel (minus a few concubines) as conquering heroes.
It's very direct. But that's exactly what makes it resonate. The radiation has bled all subtlety out of that world. It's cheyne-stokes for the entire world. Anything more complicated than that would have made the movie worse, I'm 95% sure.
Like try to imagine some love interest sub-plot between Max and one of the women. Ugh. That would have just ruined it completely.