The gore for both series isn't too detailed, but there definitely is graphic content in it.
[spoiler=Spoilers. Don't look at this if you haven't watched it yet.]For example, when they showed the failed transmutation of Trisha. Or the remains of the Nina-Alexander Chimera. In Brotherhood, they cut off King Bradley's hands and they showed it. They showed Ed crawling with a missing leg, blood everywhere no censor, trying to bring back Al, or that bloody doorway scene of Al bringing Ed to the Rockbell's to get saved. Both series are definitely graphic, but not grotesque graphic.