I just hit vet rank 2 on my nightblade and I only dual wield, I don't think it's too bad.

Though I have a few morphs for survivability, helps me stay alive and has come in handy a lot. My main spells are in order Swallow Soul, Blood Craze, Rapid Strikes, Whirling Blades, Ambush and my ultimate is Soul Tether.

I think the names are different if they're not morphed...not sure but this setup has worked for me, I might switch out Whirling Blades though, not sure. When I'm ready to do groups and stuff I will probably respec into something more useful but at the moment this build feels like it has a lot of survivability.

I'm always stealth>Ambushing mobs and it's close to a 1 shot kill sometimes but that's only for one mob, I think one of my passives has increased damage in stealth is why.

Who knows? Maybe I'm "doing it wrong" :P but I am still a newb so I don't know a lot about it, still experimenting really. Hopefully somebody else can give you some better or more useful tips xD hehe Good luck.