Is Buso Renkin underrated compared to FMA?

Nah, Buso Renkin is a little too something, maybe Goofy. Buso Renkin is kind of a cheap Imitation, you know how, once they find a hit anime they spinoff like 2 or 3 cheap Gaudy ones. This is what Buso Renkin is. You could follow the story and it made sense, sort of, but it didn't have that feeling of "Great Show" to it. Kinda how in Any of the Popular Mainstream Stuff like Naruto or Bleach, when they do their Filler Season, that's what Buso Renkin Feels Like. So No, Not Underrated.