I'm a regular at Denny's when traveling across country. I don't have much of a budget when traveling and when making a speed run, I just want to know I'm going to get decent food. Denny's usually hits it on the head.
While the food was great, the service was, not so much.
Now, mind you I did roll in at about 1:00 AM / 12:00 AM (MT/PT), but I've done that all over the west and never had service like this.
The only waitress was at the counter eating and reading the newspaper. She was obviously the only one there and was on lunch, so she took my order none the less (comes out to a draw, really, due to poor management). The waitress though looked like she was on tough times herself (and probably looking for a new job in the classifieds).
The food was standard fare for Denny's.
However, what I noticed about this Denny's from the ones I had been to recently in Arizona is this: No free WIFI Internet (which sucked because the only reason I went to Denny's was hoping for WIFI to check the weather and road conditions ahead since this was winter). They also did not have The Bite Network, which was always a great way to pass the awkward time between ordering and eating when dining alone.
If I'm passing through Vegas again I will probably not stop at this Denny's.