Yeah, the animation is really not that good. Which is a shame, because this could have been Inu-Yasha quality if it had been produced well. Another problem is that in the miRABt of the action Masahiro often has to recite lengthy chants, which slows everything down. This is probably why the show has the guardian spirits for doing more dynamic fighting, but that introduces a new problem since a lot of them don't seem to be explored very well.
For fantasy action, one would do better with Fate/Stay Night. More diverse mythology, a more interesting cast, far more exciting action, and much better animation. Sometimes, Geneon got it right too.
