After watching Equestria Girls, I felt like the movie was missing a proper villain or "boss showdown", Sunset Shimmer kind of delivered, but not necessarily. It was almost like Hasbro wanted to shove any old evil pony in to make the story seem more challenged other than just to have Twilight retrieve the crown. I didn't really think that much effort was put into Sunset, nor do I think much attention...the character was weak and somewhat cliche, and I can't see why she is a main villain. It would make sense to have her as sort of a background pony like diamond tiara, but instead she's made into this big villain, who then turns out to be quite awful (in my opinion ^^)
I literally just watched the movie, and I don't know what you think, but my villain senses have not been for-filled, I much prefer characters like discord, who have a true evil side, as well as being unique.
-don't be mad this is just what I feel