I have visited this location several times since I live a couple miles up the road. It has never been remarkable but OK for a leisurely breakfast. My last experience was the final straw however.
I called in an order for pickup. The girl that answered the phone was rude. I told her I wanted to place an order to pickup and she said "hold please". She sat the phone down but did not actually place me on hold. I could hear all of the conversations she was having with other employees and guests (I think she was the cashier). I waited for over 5 minutes. I finally started yelling "hello, hello, hello" into the phone hoping she would remember that I was on the line.
I ended up hanging up. I tried to call back a couple of minutes later but kept getting a busy signal. Finally, I got an answer. It was the same girl. I told her I wanted to place an order for pickup. She passed me along to someone else. I explained to both of them that I had called previously, been put on hold, I could hear conversations happening, I was never acknowledged again, and that I felt the service was lacking that morning. The guy apologized and I did end up ordering but I told my husband what happened he told me not to pick up the food. So I didn't.
I will never ever go back to this Denny's. It is obviously mismanaged. Customers are not a priority.