Looks like the processes they put in place to minimize the number of activists that show up just to ruin town halls and turn them into political publicity stunts for the TV cameras helped some.  Although sounds like there was still a lot of yelling and screaming. 

But no doubt the activist groups would eventually figure out how to game the system on this method too.  It's what they do.  Town halls will likely go the way of the dodo bird in favor of more electronic methods of exchange and communication.