After attempting to eat a Denny's a few times, I have given up. The first couple of times we had to wait over an hour. The wait staff was not helpful. The food has NEVER been good. And the manager seems do being more work than any of his employees combined.
All in all, it is always a bad experience. The only reason I would dine there again is if it was the only restaurant open. And even then, I would have to be very hungry.