Actually its mainly SF/BN series but MegaMan Zero/ZX games dived down into serious and dark tones about corruption, genocide, religion, war, freedom, human pollution/deforestation, and slavery.
Its far darker and serious than DMC/DmC ever was and its a E rated game.
Plus it has one of the best evil villains in video game history.
Dr. Weil (Dr. Vile in Japan).
Yeah skip to 28:00
Anyway....you may prefer style but style is just a factor of representation NOT quality.
MegaMan games may be anime fun in representation but no one can deny the writers put effort into making it a quality story with excellent character developments, interesting characters, deep plot elements, and compelling moments....well it was an RPG (those demand excellent writing)...and not turn into well....