The songs are not catchy. The constant emphasis on competition makes me uncomfortable. We have a whole other team of Shadow Bolts, but we never get to know them, like their names or anything. Only one of them gets any consistent dialogue, and it's morose.
One feature I did enjoy was the deleted scenes. They gave Sunset and Sci-Twi a little more story, and I liked that. I would have loved to see Sci-Twi's song as a duet with Sunset Shimmer instead.
Oh yeah, and I didn't care for the animated shorts. Unlike the ones for Rainbow Rocks, these didn't really add any context or even make much sense.