I had no idea who Mad Max was going into the theater, and I still had no idea coming out. He was pretty much irrelevant to the plot; I think he was just shoehorned in because Furiosa: The Movie doesn't have a lot of market value. Hell, if I hadn't been told who he was before hand, I wouldn't have even known he was Mad Max, because it isn't until the end of the movie that he says "I'm Max, btw."
Other than that, it was pretty decent for a summer blockbuster. None of this boring plot shit you get in other movies.