I agree with you for the most part, though I think Snyder shows himself to be a better visual director than he is a writer. The writing and the "characters" (definitely not enough dimensions to warrant the title) are the weakest links in the movie. The way the story is framed, leading to the Downer Ending, doesn't give us a lot of room to care about what happens to the girls.
However.
As a woman, when the movie ended I was aggravated. I couldn't explain why to my liking until I read an interview with Snyder where he explained his logical reasoning for his own creation. The idea came from wanting to reprimand sleazy guys who like to leer at women, and objectify them, and treat them like whores. So that first dream layer is literally setting up a slap on the wrist for men in the geek community who view women (and female characters) like whores, with the second dreamscape (the mashup) putting men (male geeks in particular) in the position of the male characters of the primary dream.
So...the movie isn't even about women, or its female characters. Showing support for the XX-chromosome cause isn't "female empowerment." In his own movie, Snyder is using women in the same manner he's accusing other men of doing--and "for a good cause" doesn't excuse it. It's still a dialogue between men. I mean, he threw us a bone, that's great, but I don't enjoy being the pawn in someone else's game. Particularly when the argument's going on over my head, I'm the subject, and only touted out as needed. Snyder may have had good intentions, but he missed the mark. The fact that both sides are accusing the other of being the exact same type of male says something, I think, about men and male sexuality that I'm having trouble pinning down. Until then, it's ironic in a hilarious kind of way.
Seriously though...the girls are strongest when furthest removed from reality?? I think my entire experience with this movie can be summarized as, "You're doing it wrong."