Yeah Pyro is so much better in this game its not even funny. Lightning Faith builds took it in the ass this time around, as well.
RE Dancer Blades-
They are fun, but utter dog shit because of the split mitigation issue and the spin move does next to nothing when blocked, beyond draining your stamina bar and leaving you open for a massive cornhole combo. That is from a PvE perspective (I am not into PvP) and is true of pretty much all dual wield weapons. While I have not done the Prince or Dragon yet, my general observations have been that the Moonlight GS is a good, if situational weapon. Havel's Ring is nice if you want to armor up some. The Dragon Bow is good for pulling, because the special shot travels straight and farther than the basic longbow shot. Outside of that, the boss souls items are all laughably bad. Really, with extremely little stat investment you can plow through the entire game with the weapon path of Estoc to Frostbite blade thing to Sunbro Sword (Anri's if you are doing the luck thing) and even a garden variety Longsword with Hollow or Dark on it is going to outstrip just about anything else. Halberd weapons are somewhat ok (the fire witch faming pike thing that is also a catalyst is fun) and there are one or two good spears (Gargoyle one and maybe the modded up knight ones from the end of the game) out there, but all of them are random trash drops. The boss items are complete crap for the most part and if you are not bothering with casting (hint: you probably shouldn't) you may as well vendor them. Almost all the best weapons are lying around waiting to be looted or trash drops.
That's really the biggest issue with this game (worse than DS2 at launch) along with the poise being irrelevant and the camera/target lock being completely fucked. I can safely say that 90% of my deaths are caused by lock dropping off of an enemy two inches away from me and it subsequently flipping me around so that I get a proper ass ramming from the mob. It is especially frustrating on large but fast moving enemies.