I agree with op. I'm using my mage now at level 76, (my endgame rogue is bored).
I remember running maus at level 61 with legendary but everyone else was and that made it seem quicker.
I can't get anyone to run with me on my mage.
There are plenty of people who are the same level as me but the majority just do dailies and log out. I would say they are scared or too lazy to try anything.
So someone like me or anyone else who is willing to give all available maps a go get frustrated.
It's the same with dm. You would think that I'd get a same level party easily, after all it wasn't that long ago when level 76 was cap and everyone ran it at that level..but nooooo.
Just me and another mage finished it by ourselves.
It's not that they can't do it, they won't and so I'm thinking of packing it in.