A big disclaimer before starting to watch the movies that you should remember.
It's a live-action. It means that the actors are humans and that it's impossible to recreate the same exact effects of the anime (or manga). I accepted this truth and the whole experience became way more pleasing.

POSITIVE POINTS
-they really worked hard to try to recreate the characters in all their physical details (apart from Winry, I honestly don't understand why she's the only one without blonde hair. WELL). If we ignore the fact that the original characters don't have "asian features" (at least not all of them), I think they managed to represent everyone at their best. Even the characters that appeared for a few scenes were as close to the original as possible.
-the acting was kind of cringe in some parts, especially when they tried to recreate the comical scenes, but apart from this, all the actors did a good job recreating their characters.
-the music was okay, but nothing will ever win against the anime OSTs.
-CGI/Special effects. Yes, I liked them. They weren't super realistic, but I mean the point of this story is not being realistic. They were pretty similar to the anime and they worked pretty well.

NEGATIVE POINTS
-WHAT HAPPENED TO THE PLOT? I don't know what they were thinking when they were making the script for the movies, but they surely got lost somewhere. They had a solid plot to start with and I understand that you cannot fill EVERYTHING in three movies, but there were some parts that were essential. Also, for some reason, they mixed some parts and changed the order of the timeline. For some scenes, it wasn't that bad, but knowing how it was supposed to go just made everything so confusing. And if it was confusing for someone who knew what the story wanted to tell, I can't imagine what people can understand without the anime/manga background.
This was the biggest flaw of all three movies and I was kinda disappointed because they already had a story to work with.
-Another negative point was some important missing characters. Where is Dr. Marcho??? He is super important for the whole plot...

At the end, I gave a high mark because I truly enjoy this story and I despite everything I also enjoyed the movies. They could have done better, yes. But if you are a fan of FMA they are a nice way to spend a rainy weekend. And to remind you why FMA is such an amazing masterpiece.