There is really no justification for coming to eat at Denny's, other than being open 24 hours. Come late enough and you can put up with obnoxiously drunk boors shouting at each other; early enough and you can put up with screaming fat children running amok; rest of the time you can put up with creepers at the "bar" sipping on coffee and giving you the shifty eye; and through all that, you can get a combination of the bad and the worse, all for wildly inflated prices with mediocre service, and a case of the runs to boot.
I have learned from Angelo's experience - when they serve you a raw chicken burger, and they recompense you with a free sundae, you are at the lowest of the low. AVOID.