We had an interesting go at this mission less than an hour ago, we didn't succeed though.
We had 7 rangers, 1 monk and naturally a very trap-heavy strategy. We took our time, mostly managed to control aggro, and there weren't too many deaths. I handed out some cc's to get rid of DP when necessary.
All in all everything went pretty well until we got to the fort. Then everything went pretty much straight to hell

I don't know about others, but it was my first time that far and I didn't quite know what to do. I went to the catapults, but didn't seem to have anything in range. Then I came back to trap the stairs but the trolls were too close already. Eventually we all got killed and so did Jalis. He didn't try to rush down the stairs though, which was nice.
The mission seems definitely doable, but I'm not touching the catapults since I'll probably screw things up

Might as well go trap right away. The length of the mission is a pain though, sucks to go through it over and over again only to get killed at the fort...
---
edit:
Tried it again with another, more diverse PUG and we made it! There were only 7 of us since one freeloader W/R decided to go AFK in the beginning of the mission, still, nobody died even once. We had 2 rangers trapping the crap out of the stairways, one minion master and two warriors providing firepower+cannonfodder and two monks looking after the king and us. Great team, and Jalis didn't do any Leroy manouveurs either.