didn't see the video but about those dance games, i only played dance central with few different people and it was great fun, i wouldn't play it alone for hours but i can still understand how people can love it and i would never say those games are bad or don't deserve to be successful or whatever as long as they work.
great game with friends or family/girlfriend, no clue what's so wrong with that. maybe the idea of a social life makes some people crazy^^
the only real problem i see is that most of those games only track your hands right? i mean, i understand dance central but games only tracking your hands? that would get a downgrade from me but the idea of those games is not so bad as many always say.