I used to play DDR like crazy. I almost bought metal pads but my High Octane ones worked fine for a while. Almost a year. A couple years ago I would play DDR for a good 2-4 hours a day, 4 to 6 days a week. I remember during a winter break from college I was eating a ton above maintenance and trying to bulk and I couldn't because of all the DDR.
It's not a good workout when you suck and are learning how to play with Light and Standard songs but once you get to Heavy and playing with two pads at once, that's where the sweating comes in. Playing Afronova on heavy or Max 300 or Paranoia is like sprinting for a minute and a half on your toes.
The calorie counter isn't accurate though. I think it way overestimates how many calories are burned per step.