The island was pretty fun as a multi-boxer. There are a number of places that you gain significant benefit in being in a group. In particular having a tank and healer helps quite a bit with various areas.

The final part of the legendary quest was pretty easy. I had 5xcloaks in a few hours. I haven't killed Ordos yet though, so that will be interesting.

One interesting note is that all quests and loot splashes to the entire team...even the trivia quest which I thought was amusing.