Fullmetal Alchemist: Brotherhood - 9/10
Fourth time watching the series and it's even better than I remembered. The series stands out heavily amongst its contemporaries in the Nekketsu (Battle Shonen) genre through elements such as having the most consistent major power system in anime, relying significantly more on tactics and limitations than most as well as not overstaying its welcome by ending exactly when it needed to (and with an excellent finale, at that). Along with those to boost it above many in the demographic, it also stands on its own as a story by all standards through its well done character writing, utilising all of its cast perfectly when serving their role in the plot to the point not a single one was unnecessary and great exploration and juggling of its multiple themes such as science and religion, the flaws of revenge, human nature, individualism, optimism vs cynicism/pessimism, etc. and with a great deal more maturity than many of higher age ratings (other than one exception, but we'll get to that).
Other than some minor contrivances such as Greed not using his shield fully after revival except once (which isn't a big issue when he only needed to regenerate a few times prior to the climax and he had a explanation based on his personality, but it's still a questionable element), the only thing that comes close to a prominent issue is that the humour can occasionally seem out of place. The biggest example would be Izumi's bleeding being used for comic relief when the cause of it makes the joke in very bad taste for the show's tone and messages.
As an adaption, it also does an excellent job with the pacing of the anime as well as improvements to the art through the more vibrant colour palette and great animation. The first few episodes fail as an adaption of the manga due to the far faster pacing of some events, but on their own are fine and offer decent alternatives anyway.
Even with a few minor flaws, it's still easily the best action/adventure Shonen series in anime and a great story in general.