I never thought that the original anime run of FMA was anywhere near as bad as TrollHunter makes it out to be, but the manga (and consequently Brotherhood) is an improvement in almost every single way conceivable. The only exception I might make is that the first fourteen episodes or so of FMAB are somewhat rushed. This is a consequence of it being pretty much the same material covered in the first 25 episodes of FMA before it diverged into its own thing and not wanting to rehash too much from the first show early on and discourage uninformed viewers.