I am seeing the same issue with my guild group. There were several times playing other MMO’s (most recently Rift) that I had the same experience in, which is going into a dungeon without a tank or healer for the fun of it to see if we could get through. The difference is that we were doing that for fun, not because we had to. The other notable difference I see is mechanics – there aren’t any that I can see in this game. Toughness doesn’t really exist in dungeons so that trait line is obsolete. Putting 30 points into toughness is like running a lvl 80 dungeon as a level 50 character.
I am quite disappointed because dungeons are the aspect of the game i was looking forward to, but they are just a more boring version of dungeons in ever other MMO with some choices taken away. I will still be PvE’ing and WvWvW to level 80 on my guardian and we’ll see what happens from there.