Maybe I'm not used to them yet, but I found the dual katanas to be one of the lesser weapons of the game. I don't know, it just didn't click with me. Weapons that got me through the game are the scythe mainly, then lunar and claws. I'm saving my favorite, the Vigoorian Flails, for an Acolyte single weapon asskickery run. I tested them for a while and they're even more badass than in the first game (massive air combos)