There's only one Denny's I go to by my house, and the service isn't stellar, but the food is always good, and hot, and that's all I really care about when I go to restraunts. I've worked in quite a few restraunts, and I have to say, the industry sucks to work in, and wouldn't recommend it for anyone as a first or even a second job. BUt hey - if they actually paid people worthwhile wages, and had a better hiring pool than the most degenerate redneck foul smelling people on Earth, we might actually enjoy going to eat out... But then too, we'd all be paying out the nose for our meals too....
By and large, I'm sure we can all sympathize with your debacle at Denny's... Next time, go to the good one.