Thankfully, it is after the thirteenth episode that the show completely surpasses the original in every way imaginable for the following reasons.
The first reason would be the story, as it is more tightly written than the first anime series. The first anime series had the feeling as if the brothers were just wandering around with no clear goal, making it very easy for pointless filler episodes to appear randomly. This one, the series has no filler what-so-ever, the brother's immediately moving to other places with a clear goal, resulting in a story that isn't dragged out by filler episodes. What I also find interesting about Brotherhood is that while it doesn't have any filler, it is actually 13 episodes longer than the first anime, giving me the clear indication that while it doesn't have any filler, it still has more content than its fluff filled predecessor. Another aspect of the story that makes it superior to the original would be the scale of the plot, as the story takes place in much more locations and has more characters than the first series, resulting in the experience to be quite epic in the later episodes.
The second reason that makes this remake superior to the first, would be the art and animation. While the art is certainly simpler, the animation is outstanding! The original series certainly had its share of awesome action scenes, but the remake presents action scenes that can only be described as insane! Plus, the remake is much more colorful than its predecessor, making for better looking blood, wounds, gun effects and character models.
Overall, Fullmetal Alchemist Brotherhood is the best shounen I have ever seen. The fast paced story, absence of filler episodes and interesting cast allows Brotherhood to surpass the original show and even every single shounen show I have seen so far. Definitely give this a show, but only after you have seen the first series, as the experience is meant for those who have watched the first anime series.
Opening 1: Nice song, great use of visuals. A solid opening by all means.
Ending 1: Did they animate this on Drawn to Life? Disappointing!
Opening 2: Much more energetic song! Plus, much more colorful than the last opening!
Ending 2: Again, very disappointing ending song! Better than the first, but still...
Opening 3: Nice use of visuals, but the song doesn't match up to the rest.
Ending 3: Nice song..., but it's a slide show.
Opening 4: HELL YEAH! PERFECT! EPIC SONG, FANTASTIC ACTION SCENES! BEST OPENING OF THE SHOW!
Ending 4: Wow! Fantastic! Great song, great use of visuals, also the best opening of the series.
Opening 5: Great song and nice use of visuals. But the somber mood is a bit emo. Otherwise, solid opening.
Ending 5: Good! Great song and nice visuals for a slide show!