Denny's is the most affordable breakfast in town. It is not the best food - but it is fast, cheap, and good service.
I went to Denny's around 1 pm on a Saturday and was served in under 10 minutes. My waitress Linnea was extremely attentive and nice. She helped me pick out how to order what I wanted - 2 eggs, hash brown, bacon, and a biscuit and gravy. This didn't match any of the combos on the menu but she figured out a way to give me all that for $4!
The food came out quickly and accurately. There was nothing wrong with it - just not the best. But you can't expect the best for $4 at a Denny's.
I'd choose Denny's over IHOP or Perkins any day.