Surely the initial PvE quests have to be too easy, to let you figure out how to play your character.
Although I agree that as far as I played, up to about level 13, there was no real game incentive to become part of a guild. Public Quests aside, you could do everything solo.
As for the Public Quests themselves, the only thing I would add is the ability to queue for it. That would allow you to see that there are a number of people ready to go for it, and you could tell it to start a countdown, giving people time to zoom across the zone to it. Wandering over to the PQ area and hoping there were enough people to start it wasn't really good enough, and asking in the zone's general channel only tells other people that one person is interested in doing it.