Forgot to put in "Pretty meat, but not as good as Pac-man". So I didn't vote.
I like DDR. It's great exercise. How else could your arcade cabinet be beneficial?
It's better with two people than one. Console versions with battle modes where you can screw up the other person are cool too.
On the PSX, it wasn't an arcade game, but could easily be made to work with a pad is Bust-A-Groove. Simular to DDR but the background animations really try to get your focus off the arrows.
There was a great review on it from the perspective of a classic gamer. He thought he wouldn't like it until a friend had him try it. As long as you try something slower and easier, under 140bpm in easy mode, as your first experience you could get hooked.