Most of the swords seem kind of weak to me, Zabuza's sword rebuilding itself is not impressive at all, at that point you might as well pick up new swords (although I suppose it is a step up from it basically just being a plain big sword). The Exploding sword could be useful I suppose but its not exactly an inspired concept. The bolt sword seems kind of lame since we have already seen several characters who can manipulate lightening through their regular weapons, it could be that the bolt sword is better but its still not a very interesting concept. The threading needle sword might be interesting but I have no idea how it works, if it is just a thin sword with some thread then that's just lame. I don't really get the bluntsword either, it just seems like a big heavy hammer axe chain thing, it doesn't seem to possess any special powers. The only sword that seems really impressive is Samahada, with Samahada you could see how it would completely boost the users fighting power, the others just seem like minor embelishments. The swordsmens introduction was kind of cool and I think there is some potential for them in this battle but their swords don't seem very well thought out of the most part.