The point of dungeons is to learn how to play your class in a party.

Before the update, all the fresh 50s did not know how to play in a party because they just grind their class out to lvl 50. We called them 'Fate Grinders'

I think dungeons should get more exp rewards.

This is a MMORPG. If you don't like playing with people, then stick with single player games.