I completely disagree that it was Raul Julia's best role. That's probably your fandom talking. But he did do great in the role, because he was an amazing actor, and he took even his silly roles seriously. He was seriously a legend.

I know the film totally messes up the plot in the usual way that Hollywood tries to cram everything into a short film when it doesn't have the time to do so, but the actors clearly really enjoyed doing the film, and what we got was actually a very entertaining fun film. It wasn't true to the story, but it was fun.