You're absolutely right: I haven't read a lot of the WSU. In fact, this is the only thing I've read that took place there. Having said that, I wasn't criticizing it for having derivative characters. Pretty much every comic-book superhero is derivative of Superman, after all (that's why they're called superheroes), and Supes himself is derivative of Moses. I was just pointing it out for the benefit of those who might not be familiar with the characters, so that they would have some idea of who these people were. In retrospect, I can see that I may have come off as kind of flippant; that was merely an attempt to be light-hearted, not cutting. Sorry about that.
I don't doubt that the authors you mentioned did some excellent work.
As for your characterization of the miniseries, I disagree strongly. Neither Majestic nor the Authority are portrayed as idiots at all. Just as incredibly smug and self-righteous and far too willing to resort to deadly violence first. And the Authority did figure out who Cap was; in the end, they just didn't care.
As for Jenny Quantum being able to contain whatever was wrong with Cap because she once ingested a supernova, realize this: a supernova explodes with enough force to destroy a solar system. Cap was going to explode with enough force to destroy the universe. As I said to icon_uk, Cap once created his own universe, and later destroyed it. He's that powerful.