The only reason this is not the worst show is that TMZ is still on the air. The show does have a plot--a thoroughly predictable plot, but I can live with that in a show that's aimed at tweens. It's hard for me to assess the dancing talent because the choreography is so bad. You don't just put ballet, hip-hop, and gymnastics in a blender and hit "mix." Having all three elements in a dance is not a terrible idea, but they have to be brought together with finesse, not because the studio is a democracy (everybody gets a voice). And choreographing an ensemble dance routine and learning it in a day is completely unrealistic. It's unclear what the studio choreographer's role is, since the routines seem to be made up by the students themselves. In fact the studio owner doesn't contribute much, either.
There's nothing one can say about the music; it's simply unmemorable.
The gimmick of the behind-the-scenes interviews doesn't work. These kids can't act, and their drama is overblown. It's really a caricature of teenagers and depicts teens as universally self-absorbed. The other problem with it is that some of the interviews happen in the middle of the action. For example, a given actor is in the middle of a dance; then the scene cuts to an interview with that dancer commenting on the very dance that's ongoing! There's no logic to that.
Finally, the acting is just phenomenally bad. I want to just chalk it up to the actors' youth, but I can't, because there are some pretty terrific child actors around.