Disney Sing It is a flawed but ultimately fun experience. Because the game mechanics are solid in comparison to some of the other karaoke titles on the market, your enjoyment of this offering will depend solely on whether you like the song selection. If you are a fan of songs from The Disney Channel, add a point to the score. You'll have a blast singing along with the featured songs from some of your favorite movies and artists.
If you absolutely loathe that network and its content, then subtract a point from the score because listening to the songs on this compilation may hurt your ears. If you don't care either way, take the score for what it is. There will be a few songs you'll end up singing and enjoying, but you'll want to move on to other games fairly quickly for some meatier content.