I cheer at the idea of gating content behind the beginner's hall.

Wanna go into this new dungeon? Its no walk in the park. Youre going to have to prove that you're up for the task. Theres other players that depend on you. You're a DPS, try killing this dummy within the time limit. Cant do it? Other people can. Try harder! Can't figure it out? maybe you can ask other people for help. I'm sure someone out there would want to be your mentor and give you some advice.