Now that the series has ended, I can say without doubts that my favest song is Again
, and not only among Brotherhood ones but in general (I still like many of the old FMA OPs and EDs, though). It's just so full of energy, and the visuals that goes with it are perfect imho.
But I love all the OPs and EDs to say the truth, so I ordered the compilation (the limited edition one which includes postcards and a DVD). I can't wait to receive it!
I also like the soundtrack a lot, but I agree with many of you about it non being used on its full potential in the series. When I've time I'll write which are my favourite tracks!
I like a bit less the characters theme songs, but there are some that are good nevertheless.