Funcom has said that the instances scale based on how many people are in it. So it scales up for 2 people, and up again for 3. So it was designed to be done solo, with only 2, or with only 3 people. The problem people face is that it isn't quite balanced properly for 2 players. Currently, it is hardest when done with only 2 people.
And I also agree with GeneralFear in that I enjoy this content too.