Was anyone able to farm the undercity yet?

It should be very possible. I already tried it, but it's pretty damn hard, because I cant get the build right.

So far I'm thinking along the lines of ripostes, melandru's resilience, heal sig, watch yourself.... similar to "lambda the great's" ember light camp farming build...

The only problem for a war would be the mesmers. Empathy hurts in a solo build.
Going almost all war skills is a good idea though I think. You might possibly think of using Shield Bash to disable Cylone axe etc.

i was running there solo with this build but had a hell of a time killing fast enough though. plus if a monk or rit boss is there then forget it =(.

Grenths Balance - Life Saver!
Penetrating
Executioners
(The new skill that resembles Pentrating Blow)
Heal Sig
I Will Survive - Kill warriors last since they cause the conditions that give you + regen
Watch Yourself
Sprint