I was given my very first pre-release preview of a game, and low and behold it was Grease Dance. I have to say that I wasn't originally all that excited to play the game but I was pleasantly surprised with the game. I'm a singer and so it was smart of them to include the karaoke, which allowed for me to enjoy the music of the game without having to dance.
I wouldn't buy the game myself, but it could definitely be fun for the right audience. Check out my preview.
Oh yeah, and here's my video preview of the dancing in the game.