The guys at Joystiq are going over their first Diablo 3 multiplayer experience during Blizzcon.
The quality of the video is way better that most I’ve seen. You need to wait a bit for the multiplayer gameplay to start (at 3:08). The party is complete with all three Diablo 3 classes: Barbarian, Witch Doctor and Wizard.
The only complaint was that the screen was a bit overwhelmed with all the special effects, however, playing the game feels amazing.