I would like to like Moondragon better. However, if you look up the definition of entitled in the Marvel Universe, you will find Moondragon.
Moondragon is a human being who has achieved both physical and psychic perfection. You can do this too, if you train with outer space monks. Delusional, she believes she’s a god, and while she is influenced by the entity from which she takes her name, she’s a powerful metahuman with privilege issues.
As my friend Steve said, I talked about the Wasp’s costumes, but I didn’t object to Moondragon’s. Well, Steve, I do object to Moondragon’s 70’s costume. Like you said, this is very much accessory, and not costume. 
Does this costume hearken back to a freer, more liberated time, or is Moondragon’s costume Marvel trying to equivocate that naked is cool? Well, all I gotta say is wherever you come down on opinions about the costume, I don’t think you can do much advanced martial arts in an outfit like this.
Fortunately, Moondragon’s outfits settle down a bit as she moves forward in time.
Moondragon dances on the edge of morality throughout her career at Marvel. Full of herself, she is a short-lived Avenger. She is often monitored by other heroes and heroines who don’t trust her, and they shouldn’t. Under the right circumstances, you could even see Moondragon as a villain rather than a hero. However the character is fully realized. She’s not a pleasant character, but she is a strong one. I’d rather not see Moondragon in a Marvel film.
She was not terribly well handled during her mid-70s stint; as you say, the sense of entitlement was ridiculously unsupportable (though her effect on Thor was notable, with her constant assertions that he was far more powerful than his Avengers comrades – arguably true). And the costume… sigh. Not familiar with what might have been done with her since – she seemed to drop off my radar quite a while before I actually stopped reading. I don’t miss her at all.
Didn’t she actually become a villain at one point? I seem to remember her turning on the Avengers and leading them into a trap or something. Regardless, she always seemed deliberately unlikable to me.
Surprised you don’t mention Mantis at all. http://en.wikipedia.org/wiki/Mantis_(Marvel_Comics)
Moondragon was actually pretty cool during her stint with the Guardians of the Galaxy. Good writers and true love can work wonders.