Sing It: Pop Hits for Nintendo Wii

I bought this for my niece as a gift, thinking she would love it.  She loves singing all of the Disney hit songs, and has a Wii, so I figured it would be perfect.  She does like the game, but gets bored with it quickly.  It would be better for older kids or teenagers (she is 5).  It grades you on how well you sing, and has different levels of difficulty.  Some of the songs I wouldn't really call "hits", as none of us had heard them before.  It was a fairly expensive game with not much replayability.