If you ask me, this was an episode that at least did it's job. It gave us an overall plot and gave us everything we could have expected from it. However, it doesn't seem to try to push the envelop, which is what really hinders it. It's nothing more than an average episode. If it wasn't for the ending, it would be forgetful in the grand scheme of things.
I get where the Cutie Mark Crusaders are coming from. School can be rather boring sometimes. (Seriously, Cheerlie wasn't winning any "Most Fun Teacher" Awards here.) Then you hear about this school that teaches while having fun at the same time? What more can a kid ask for? Heck, I'd probably be right along with them if I was their age.
However, this is a school that teaches friendship, a subject those three have overall mastered over the years this show has been around. I'm not surprised Twilight didn't let them in. However, this leads to some crazy antics of them trying to get in. Some of which I couldn't help but facepalm at.

We then get a new character, Cozy Glow. She is a student at Twilight's School of Friendship, and she is struggling. So the Cutie Mark Crusaders decide to help her out.
You know what? I actually like Cozy Glow. Not just her design, but she has a great personality that blends well with the three. If she becomes an honorary member of the Cutie Mark Crusaders, I'd be all for it. I do want to see more of her. Plus, I do want to know what's up with her cutie mark. Maybe it has something to do with chess.
Her failing was quite a surprise, especially with how much work and effort was put into the whole thing. We then get the Cutie Mark Crusaders being banned from the School of Friendship. However, we then find Cozy Glow failed on purpose. This at least gave Starlight something to do since she was so bored. It seems Starlight's "evil side" still exists to some degree. Anyways, we then have everything worked out. Cozy Glow confesses to everything she did and then we get a big surprise.
The Cutie Mark Crusaders not only graduate without even attending, but also become honorary tutors. Like I said, if it wasn't for the ending, it would be forgettable in the end. Instead, we get a big change for the Cutie Mark Crusaders. Hopefully, we can see more out of it.