Opinions are funny like that.
I can see why people would enjoy the movie, and i would probably enjoy it myself if i didnt appreciate a well put together story over pure entertainment value.
EQG delivered the latter quite well, as the catchy songs and the animation quality could attest to, in addition to the jokes that quite a lot of people who disliked the movie as a whole can say they laughed at.
EQG did not deliver the former..well, pretty much at all.
Almost every situation comes about because the plot demanded it.
>How does Sunset Shimmer know about Twilight if she's not been back to equestria since she left.
>How does she know what an element of harmony would do in the human world.
>Twilight slept in the library, how did the librarian, who was already pissed off with her, miss that.
>How the hell is human-luna the vice-principal if she's so damn retarded.
>"Hey, you're a bitch who broke apart ours and presumably hundreds of other friendships in this school over the years to establish easily controlled cliques that you ruled over with iron fist. We should totally be friends because you didnt know that was a bad thing."
The climax of the film is meant to contain at least some explanation for things, but all it does (for me at any rate) is make certain questions extremely glaring.
>Element of harmony + person who's not meant to use it = a monster.
Okay, did shimmer know that would happen or did she just think she'd gain the magical power?
She knew something would happen, but whether that was just "having access to her magic+ a boost" or something is confusing.
Especially since the tears during her transformation sequence indicate that it was really fucking painful or something.
Personally, i would have liked the rest of the mane5 to come charging through the mirror wearing their elements (And looking like their pony selves because of it or some crap.) and blocking the death blast instead of the others.
Then you have the whole transformation sequence with Twilight on her own followed by the defeat of shimmer and everybody's counterparts going "WTF" at each other / Rarity in particular fangasming over all the clothes / FlutterHuman fangasming over the magical talking equines.
Bonus points if they do it in synch, with their counterparts apologizing for the other.
The mane5 come charging through because they saw what was happening through the mirror, which is something you would kind of expect from a magical mirror that's a portal to another world.