It's a bit different to the Batman games, or Shadow of Mordor. I'm a bit of a noob with Dark Souls (~20 hours game time) but love the combat (Although the world map is my favourite bit - mindblowing)
It's not so much slow as it is deliberate. The weapons have weight, so a swing and miss can really cost you.
batman is very good, liked arkum asylum on 360 very much till i got into other games so didnt complete it, never played the new one, just not liking the look of this DS3, just something about the combat is off putting regardless of weight physics.