The only aspect of that analysis that I will disagree is the emphasis on the individual. While I may not be as familiar with the work of Nietzsche, the Federation had a lot of social planning, and contributions to society by the individual.
I'm not really how to articulate it, or familiar enough with Nietzsche to see how the individual works in society, so I apologize for any misunderstanding. But, I do agree that Star Trek became more and more about the ideal human, and evolving past where humanity is at the moment.
As for the OP, most people have articulated it well, but the action-adventure in space with social commentary idea is what has always been clear to me. It means a lot of different things to different people, though