Thx capuchin, does ninja get any decent gkt at 119? I haven't played nin very much since I returned
Nope.
People were doing this with Blade: Chi a while ago but I think the interest trailed off at some point. You need favorable conditions for both physical and magical damage for those weaponskills to perform well.
In theory, I guess for a mob that's safe to melee and isn't particularly resistant to phys or magic, you could probably make a really killer setup with multiple NINs using magical WS with a good set (and all bursting on it). Or even mix in something like a BLU, or an actual nuking mage.
The harder part is likely convincing other people to let you try the setup and giving the right buffs... So for me, it's prob more of a solo kind of thing.