I don’t have much experience with GW2 dungeons, so I will keep my comments short:
1. By and large they seem to be too difficult.
2. A challenge is one thing, but players would like to be able to run the dungeons because they are fun and to build friendships, while getting good exp and loot.
I am a WoW player for the past 6 years, and am enjoying a change with GW2.