Fullmetal Alchemist: Brotherhood is probably the best series I've ever seen. There are several reasons for this:
1) The story is truly compelling! It really grows on you, since the viewer wants the Elric brothers to reach their goal of getting their bodies back, because of their hard childhood, where their dad left home and their mother died. You grow a sympathy towards these two boys. The plot is amazing, though I don't want to spoil anything. The idea of Alchemy is great in my opinion. So I'll give the story: 10/10
2) The art is top notch, the fighting scenes are amazing and the backgrounds are beautiful. The characters are well-made and they actually seem really human, though they are animated. (Wrath's fighting scenes are awesome!) - Art: 9/10 (almost 10/10l)
3) The sounds in FMA Brotherhood is good, but still the show's weakest aspect. Sometimes the background music doesn't really fit, but it doesn't bring down the show. The opening and closing songs are really good, the second opening is one of my favourite Japanese songs. The genereal sounds and talking are good as well. - Sounds deserve a 9/10 (Close to 8/10, due to the background music being out of place at times).
4) What really made me love FMA: Brotherhood is the characters in the show. They are truly geniously put together. I am a twin brother myself, so I was really touched by Edward's and Alphonse's brotherhood, since I feel that I would go through the same shit as they do, only to help my brother.
Roy Mustang is a great character, who has quite some shadows of his yesterdays hanging on his shoulders. He has killed many men during some civil wars, which happened in the country.
Scar is also an important character, who was filled with hatred and seeks revenge on the State Alchemists, who destroyed the Ishbalans, who was Scar's people.
Louis Armstrong is a fun character, who brings a nice humourous aspect to the show with his Gai Sensei-like emotional and masculine behaviour.
There are tons of other great characters, I could go on forever, but these were the highlights to me.
5) All the reasons mentioned above made me enjoy this show more than I've enjoyed any other show. The plot is amazingly well-written and the characters are really believable and sometimes this show just bring the chills, since you really symphatize with the characters. The ending is just perfect, so I'll give FMA: Brotherhood the biggest 10/10 I've ever given to any show.
