My only problem with DOE is that it sucks when there is a large difference in Levels between players. It scales the difficulty to an average of the player's levels. So what ends up happening is the higher level players just one shot everything and the low level players are as useless as a chocolate teapot. Or the high level players tone down their game and sit back to give the low level players a chance to play a bit, just support them if they get in difficulty.
For example, last time I played with Ravenger and Shi, which was ages ago, they were a only few levels higher than me, maybe 20 levels or so. Even then I was basically useless. They could kill the mobs before I even had time to close in. And when they got in trouble, I was no help either because the mobs were higher level than me and could one shot me no problem.
I haven't played in ages, so I am sure the level difference is far larger now. So it would be even more unbalanced. And even more boring and frustrating for me!!
This seems to be a common problem looking around the various forums.