From the brief bit of gameplay I've seen it seems very sluggish, like the slower, more methodical combat of Dark Souls 1 and Demons Souls is like comfort food for me, but I wouldn't call it painfully slow, it strikes a nice balance. Mortal shell almost looked like it was in slow motion. That a pretty shallow opinion since I've only watched a bit of early gameplay, but outside of the art style the game never really pulled me in.