I'm surprised this is so low rated because it was always super packed. Maybe it's not amazing, but it's popular, so I'm sure Denny's is satisfied with that.
I'm sure if you've been to any Denny's you know what to expect for the food. In this popular Strip area, there aren't a lot of breakfast options, and this has more well rounded options than going to McDonald's or Starbucks or some more expensive restaurant.
I came here 3 times for breakfast during my trip, and there was always a wait and not a big wait area. The service was a little unreliable, but it was packed, so of course that's going to be expected. I never had a problem getting a coffee refill as it seemed one person walked around to all the tables to refill those.
It's not a quiet, relaxing atmosphere, but you can get some low calorie breakfast options. I only had to wait about 10 minutes for a party of 2, but if you have a large party, I'm sure it'll be a lot longer. They also serve alcohol. Honestly, you have to spend so much money on food to eat on the Strip, so I was glad to get a hearty breakfast and okay service. More money to lose in the casinos!