I definitely liked the episode a lot. I'll admit, it didn't quite reach the emotional warmth I was hoping for, but that didn't detract from it too terribly much and now that I know what to expect I'll enjoy it even more upon re-watch. As for AJ being so over the top as to detract from the episode? I'm not seeing that. It wasn't a sudden out-of-nowhere about face. She was clearly shown as growing increasingly worried while with Big Mac delivering the pies. I dunno. It seemed to flow just fine to me.
Loved the dialogue. Sass, song, bows and hats, double helmet, and cajun ponies. My god, the cajun ponies. I loved that so much. I know it's a long shot, but I really really
really want to see them again. I was also under the strong impression that the town was Hollow Shades which, if true, wold make me extraordinarily happy. I don't know why, but ever since that map of Equestria was released something over a year ago, I've had this little nagging obsession with Hollow Shades.

Just something about it... dunno. But yeah, hope to see it again.
So, in short, because so many people care, I'd give it a solid B+ or maybe even an A-. Very good episode that just lacked a little punch.