I rented this game expecting to really get into the singing and I was highly disappointed because the game is about going left, right, up, down and such and honestly it makes the game very boring. Grease is legendary and this game makes a mockery of it with the boring actions, and nowhere near realistic graphics. It is a 2 in my opinion.
There is no happy medium with Grease the game. The lyrics to songs such as Greased Lightnin' are too adult for children so you get lyrics displayed as such: It's a real P-asterisk-asterisk-asterisk-Y wagon, which is lame. And basically all you do is move the Wii remote back and forth along with the singing (which is not even performed by the original cast), unless you use the Wii Balance Board, which I did not do because I immediately knew this game was going to suck.
For those of you expecting John Travolta and Olivia Newton-John, you will also be disappointed as no one from the original motion picture cast is present on this very low quality game. As a true Grease fan, I was sorely disappointed.
If you want a good dance game with good music, get Just Dance and lose this turkey.