I love Denny's and I'm not afraid to admit it. All you yuppies will just have to deal with it.
Obviously the breakfast food is good (and served 24 hours), but the other stuff is good too. The great thing about Denny's is the consistency. Every Denny's is the same. It's always a safe bet if you're traveling and are timid to try someplace new.
Pancakes are one of my favorite foods. I want just butter and maple syrup, and that's just the way Denny's makes them. I don't want heaps of sugar like whipped cream and chocolate, that trash just overpowers the taste of the actual pancake. Denny's will have specials from time to time with things like pumpkin pancakes, but they are always able to stay true to the classic buttermilk.
The other thing I usually get at Denny's is the Moons Over My Hammy sandwich. There's two different types of cheese, eggs, and ham. The best part is the super buttered up toast though.
Honestly, you can't go wrong with Denny's. Its affordable and delicious.