I thought it was great. Our Alliance went through a few times. I was a healer on two of the runs. We had a pretty good time, except for the part where we got lost in (Room 5?) of Urgoz for an hour and a half.

We kept dying at the point where all the wardens pop up right on top of you. Never quite figured out that section.
Getting a ferry is not generally much of a hardship, and it is easy enough to leave a spare character parked in there. I'd like to see the double rare drops left on though. It makes it more worth while to go.
I thought the event was pretty good in general. But I think limiting entrance to the missions may help keep out the people who have no idea what they were doing. (Honestly, a level 15 wanting to go? Not going to have enough attribute points. )