It´s good when it´s not too crowded.
It´s located next to my hotel in Vegas, and I went to Denny´s for their cheap and relatively good sizzlers, as a breakfast alternative, for a couple of days.
The service changed on a daily rotation, and they all were really friendly.
One day I came around noon, and when it filled up shortly afterwards, a queue was forming at the entrance. One of the female employees started to continuously yell names of guests that were to be seated. That sound was quite disturbing. I believe that there could be a more peaceful way to process the queue.