I can safely say that the ending was outrageous...
This episode was very rushed, not even the songs made it better, although the songs were good, the reasons supporting why she became a princess were very shallow, it still doesn't convince me...
Pinkie Pie was, as always this season, a bit annoying (no offense, Nihi), and I don't like how the other Mane 6 were like "YEAH AWESOME WOO", it just doesn't seem right...
The storyline is so cheesy that we can harvest cheese from it and feed the world for a decade...
I didn't like how Twilight INSTANTLY became a quick flyer, having the same flight acceleration that Rainbow did in A Canterlot Wedding and did a rainboom, it just doesn't make any sense...
Twilight is now getting all the attention, it seems, she became a princess just because she finished the final work of Equestria's greatest wizard (AKA, the Gandalf of Equestria), sure it is friendship and it is important, but that's not a solid reason to become a princess...
It also doesn't seem fair that Twilight does one thing about friendship and becomes a princess, while Rainbow trains for three years to become at least a Wonderbolt Trainee, her hardwork now seems useless...
Also, Shining Armor was there, useless as usual, and this time, so was Cadence... (who wants to correct me and say Cadance, deal with it)
Also, if they continue to do an episode like this, then we have to call this show "My Little Twilight: Musicals are Magic"...
I cannot judge this fully yet, and we will have to wait until the next season starts and see more great work from the writers, especially McCarthy's and Larson's and Merriweather's work...
So, the ratings:-
Animation: A- (Although it was a weak episode, it still had very good animations)
Humor: C- (Very few jokes, and they weren't funny...)
Script: C+ (If the catchy songs didn't count, it would have been D)
Lesson: D (There's no lesson from the coronation, and it is semi-impossible to comply to the lesson since it was ... only about helping other friends in need, and we already had a lesson about that, I think...)
Overall Average: D
Yeah, I gave "poor", have a nice day...