Is this game fun? Yes, and I don't even watch these movies. However, everything about it -- simplistic graphics, a short Story Mode and a limited set of gameplay modes -- screams budget title, but here we are being charged full price.
If you like the movies, then add a couple of points to the score and purchase away; if you haven't bought it already, that is. Unforunately, we didn't like the movies, so it's difficult to see past the dodgy presentation and lacking gameplay. Stick with SingStar.