I suppose I just don't see the focus on subplots - Goose for instance - as a flaw, per se. Plus I don't think it needed lots of extra scenes to explain the court case. Bogging the film down in that would have detracted from the stripped down action and menace. I think Mad Max demonstrates the principle of creative limitation very well. It's incredible what can result in skilled hands with very little.
All that said, I will concede there are tonal inconsistencies and moments where the meagre budget is stretched to breaking point. However, these are minor nits rather than major issues, to my mind. It's still a brutally efficient and effective piece of work.
Is nostalgia at play? Well, I didn't discover the Mad Max films until I was about seventeen, so talking about "childhood" is a bit of a stretch. But yes, I loved them the moment I laid eyes on them. Obviously Fury Road was just a twinkle in the milkman's eye at that point, but it's important to not lose objectivity through nostalgia. :)