I watched the first version of FMA and didn't get into it as much. Brotherhood has it all for an anime, its very addictive, dark but not too dark, and deep but not deep enough to drown.
The story is interesting and stays true to its premise and magical system, almost to the point of ad nauseum. The art is consistent, the sound is better than average and the characters are very, very solid. Not over the top personalities, but memorable.
It has enough intrigue and pacing to keep it interesting and enough action to make it marathon worthy. Highly recommended, but would caution going into with high expectations. I don't feel as if this anime does anything particularly amazing, but it does everything well.
