This is the most unfriendly MMO I have ever seen to group. You have to have the exact number of players of a specific level range to enter some dungeons. And you must all be on the exact same step of a quest. This is really a joke. MMO's are really about grouping and questing together, people helping each other etc.
Dungeon strength should scale (with caps) to the party and the dungeon should be presented to the players with the lowest step on the quest.
Also the group leader bug (a full group and no one is the leader) is back.