Let me get you some answers, Tandor.
From your forum information I presume you're doing it on Gladiator so as a tank you've in very high demand. Group-based dungeons are downright mandatory, they are required for main quest progress and main quest progress is required to unlock further quests in other areas, unless you plan to live solely by levequests.

Most DF groups i've been with have had extremely friendly people even when they are the derpiest, with just about one group with a certain 'gem' of an arcanist. Then again, there are quite a few complaints about bad partymates around in regards to the DF so I don't know what to say. If you're in the same DF cluster as Excalibur I can at least say that in off-peak hours people are overall nice.