I saw it and I did like it. It was a good way to kill an hour-and-a-half, or however long it is. As long as you don't go into watching it expecting it to be completely amazing and the best MLP movie ever, it's fine. The songs are catchy, the characters are the same as they are as ponies, and the story is...there. Nothing spectacular, but it's not horrible. It's just Hasbro's answer to Monster High, so keep it in the back of your mind while watching that that's who Equestria Girls is targeting.
As I said, I like it, and would watch it again if I have the chance. Personally, it rekindled some of my pony love and reminded me of the first season's episodes.