It's basically pretty balanced, a dwarf barbarian will play really well I think.
It also can be a very simple class to play. I had a brand-new to D&D player come into my last game who said she just wanted to hit things, so I made up a Barbarian for her, it went fairly well and she was able to get most of the mechanics by the end of the session (we didn't have a huge amount of time to let her read the PHB or explain everything fully) so I would consider it a success.
Just make sure they know since it's a playtest they will likely need to rebuild slightly when the PHB2 comes out.