When she finally gets to the other side, she realizes that it's not Shambala, a land of wonder, but a parallel to her own world, with human inhabitants. This scares her- it's not what she expected to find on the other side!- so she does what Nazi do- decide that all of the problems are caused by people not like herself, and commit genocide against them.
It just felt like such a shallow idea, that she'd instantly try to destroy this new WORLD she just came to. I could understand if Amestrias Was the ONLY place in existence; if there were no other continent, culture, tribes, etc. But she went to a place with people much stronger than her, and with a small army, decides to settle into all-out WAR from the first moment.
It was truly a panic reaction, but it still feels kinda poorly developed. I would have preferred her to get there, try to implement martial law with a show of pride and might... then have the stronger, clearly superior power put her in her place, and THEN have her panic.
Looking at the idea on it's own "Nazi gonna Nazi, but you can't pull that crap off VS FMA's Alchemist!", I can just point and laugh at her character, for being revealed to be as cowardly and shallow as I'd want to believe a Nazi be.But as a fan of FMA 03, I just want a more well-rounded character.
I thought it was fairly obvious Ed doesn't really care about him as "Alphonse", and instead just sees him as an end to a means. Early on in the movie, when Al is getting ready to have his rocket demonstration, Ed just goes to take a nap in the truck instead of being with him for support when it's time for the actual launch. He has lived in this world for a decent period of time by this point, and the reason he is with Alphonse is more due to rocketry (which, as a scientist, Ed is fascinated by as it doesn't exist when he is from) than the fact that he looks like his brother. By the point we are at the movie, Ed has realized that despite appearances, they aren't the same people. He only freaks out when he sees a copy of Bradley, who he knows wasn't a "real person" on his side. He shows emotion when Alphonse dies, but that's more about him sacrificing himself for Ed than loving him like a brother.
Obvious, sure, but I just find it kind of a misstep. But maybe it's Ed's "This is all just a dream" nature that I not only dislike in him, but in the whole movie itself in general; as big and important as these characters are in the movie, we're forced to look at them as simply parallels to a more interesting, more "real" world. Our main guide in the story barely seems to care about them, so he's telling us not to care, either...
... which kinda sucks, because we spend a LOT of time there. I'd have liked to see these people creep more and more into Ed's heart, and for him to have more difficulty with his choices and decisions. It would have done the story, and Ed, a service. Instead, this is just forced into his face by Alt. Alphonse, and we get that moment, him passing by Noah, and then him seeing Alphonse dead, as the only real points of him facing their reality.
This all would have probably been handled really well if this were a mini-series, but I think I feel it was just too much for the movie's boundaries.
Basically, I would have liked Ed to have grown up as much as Winry had. She seemed to have taken all the things that had happened in front of her, and just gotten stronger from it all. Instead of waiting for the Elrics to return, she went out and actively did something about it. She was as prepared and forward-thinking about each situation she got into as she could be. She reminded me that we'd been through a series before getting here, whereas Ed just felt like his growth stunted. I felt like I saw more progression of character from her than Ed.