Last night i grouped with 2 friends and completed some mission bonus and quests.
We filled the empty spaces with henchmen.
It took us 3 tries before getting all the armor pieces in the Great Northern Wall. We were always missing one piece and we got trough every wreckage in the stage.
Also, we never could find the war machine plans after killing Ore Darkwhip in Minaar's worry quest. We're going try again tonight.

It's nothing serious, but it can get annoying.
I know that we should group with real people instead, but henchmen are there for a reason.