I can't tell you how many hours of wasted time I've spent doing various Random Q's (advanced and intermediate). When starting out, it looks like the DPS of the party is awesome and the healing just might work out. Then we hit the final boss (and sometimes the 2nd to last boss) and things peter out.
Here's the list:
Many Coins Bank Heist: I've only been able to complete this one time (doing this probably a couple of dozen times now) after Mod 16. The mobs become insanely powerful for this supposedly middle-power event.
Tiamat: This was a lot of fun...okay, maybe a little too easy before Mod16. Now, I haven't been able to see this finish yet, Tiamat just keeps getting refreshed; the party can't kill the heads fast enough and the heads appear to have much more staying power and breath weapon power.
Nine Gods: I've only been able to see this completed once. The final boss and the ghosties are insanely difficult. I've seen very strong parties wiped out too easily and usually when the boss is at about half to less than half of his HP. What really sucks about this one is that you invest a lot of time before you figure out that you ain't going to be able to finish it. It's quite deflating and makes the game almost undesirable. I'm not as excited coming back to it after I waste that much time.
I think I'm forgetting one or two more, but you guys probably can fill in those blanks.
Is there anything going on in Dev-land with these or did they just set the bar that high deliberately? I know that as I approach 21K that I am not even within striking distance of doing LOMM yet (since my overall stats are too low to realistically even try...so I don't!).