What???? I assume you're talking about the confrontation with the Nazgul? That wasn't about her being "Wonder Woman;" it was about the power of the Elflands to turn back evil.
Strider as self-doubting, not wanting to be king?
I don't know where you got that Aragorn didn't want to be king. Yes, he was self-doubting; he had a crushing legacy to live up to. A legacy that had long been denied him. And it didn't look like he had much of an army behind him to help him reclaim his throne. I will say that the poor casting of that idiot Vigo Mortenson as Aragorn was a mistake, but I don't know that that was Jackson's doing.
Frodo turned into a whining weakling?
Frodo never intended to be a hero. He was a Hobbit, a dreamer, a simple Shireman. Being tasked with arguably the saving of the world -- along with the burden of bearing the Ring -- would probably weaken just about everyone. I don't think Elijah Wood overplayed Frodo's doubts or his humanity.
Jackson does action sequences. Character development is beyond him.
Jackson didn't have to develop any characters. Tolkien did it for him. All he had to do was stay true to the narrative. Which I'm convinced he did -- within cinematic limits.
“What???? I assume you’re talking about the confrontation with the Nazgul? That wasn’t about her being “Wonder Woman;” it was about the power of the Elflands to turn back evil.”
No. It was supposed to show Frodo - meek hobbit that he was - had the strength to TRY to resist, although he was then saved by his friends. It was one of those critical moments when Frodo’s strength was revealed - his strength of character, not physical power.
Frodo defies the Witch-king of Angmar. He would have lost without his friends because he wasn’t a mighty warrior - but he had the strength to resist. To try. Even while badly wounded.
Giving that to Arwen robbed Frodo. By repeatedly robbing Frodo, Jackson left him with nothing to do but snivel.