I prefer the animation of the Souleater-Combo over the Powerslash-Combo. Souleater looks a bit like Climhazard, a Limit Break from Cloud Strife. And I guess, it is intended, since DRK got Cloud's battlestance- and victory-animations, too.
But I would like to see more animations with wide swings with the greatsword for AoEs, because greatswords were used to hold a position by keeping opponents away with wide swings. Sadly, the AoE-Combo of the DRK is a combo of spells not weapon skills.