I honestly haven't had many bad DF experiences. I'm still not at the top end as the highest I'm running right now is expert roulettes, so maybe things change at the very top. The worst I've seen so far is a few rare players demanding bigger pulls when I'm not entirely comfortable doing them yet. I try to gauge the party on the first pull, and if DPS and healing are on point, I chain nearby packs and patrols together for bigger pulls, but I don't do any crazy running across the instance giant pulls yet. The worst case was my first time in Sohm Al (hard) when I was sitting right at the minimum ilvl (230) and had an impatient DPS demanding huge pulls and even claiming I was overgeared. They settled down after I called them out on it. I think they just assumed I was at 260/270 or something without checking.