I had a blast in there on dino island when the groups insisted 3 was the minimal number of mobs to be had at any given time with 5 being more preferable, even when it was a Brachiosaur up.
And I do mean quite literally "any given time." The entire Diadem run was a never ending battle and I felt physically exhausted like I had actually been in the thick of it by the end. Unfortunately, never really had that experience again afterwards.
But I got my pegasus, which is all I was after.