Personally I tend to fall under the "straight swords aren't busted, greatswords just don't work anymore because you broke poise" line of thinking. Granted, Dark Sword probably needs to be knocked down a few pegs, but nerfing straight swords doesn't really fix the core problem of why straight sword users are stunlocking people with ultra greatswords to death; poise being broken is what did that.
Heh, I'm level 185 and haven't even been PVPing. I've just been using them since it works better for bosses for me than other weapon types, especially since I can buff it with Fire/Lightning/Magic/Dark/Blessed on top of the SSS's own buff and get nearly as much AR as the big weapons, while being able to swing 9 times super fast with it. 40 Str/Dex and 30 Faith atm, for reference. May bring faith to 40 for better weapon buff scaling.
Also I'd really like to dump levels into luck and hit 99 with it, just to make
Anri's