And that's one of the reasons why I stopped using the DF for anything besides getting a last man or helping a FC mate, and in those cases I don't do the dungeon the same way as I would do it if I was with my FC alone. Some wannabe speedrunners (that's it, those that have been using and still use the DF for SR instead of making a good premade) are a headache, and their attitude versus other players is even worse. Note that to be an a-hole you don't even have to open your mouth sometimes, so I don't care about excuses like "I never namecall anyone, I just go ahead at my own pace" and the likes, specially in situations like those that the OP explains.

I'm still not sure if the rewards on the Duty Roulette will be worth using it, and I don't know either what side effects will it have on the DF and, of course, on people new to any duty. CM/Prae again, but this time on more dungeons, starting from level 15? Who knows, we'll see.