eh, gotta disagree a bit.
I'm not saying its BAD; I think its decent. I just don't think its that level of goodness. its more a 7/10 or so, slightly above average, but not GREAT. The plot's premise feels a bit too similiar to sound of silence, but without the kirin charm. it feels less like a "special" plot and more like what a normal 30 minute episode type plot (and on that note, THIS is the kind of stuff the map should have been sending them too, small issues around equestria like this).
The good notes are many, even if I think its only decent however; They make sure to give all of the group focus, its nice having someone ELSE as a central catalyst to the start of the plot besides twilight, All the characterization feels good and proper, and there's lots of nice little jokes (the rainbow bass bit was pretty nice).
Nice ending, and overall its refreshing to have a special like this where there's no real "Low" point, the mane six never fall prey to any stupid actions or miscommunications that impede their path to fix the problem (like twilight being left by the other 5 in the movie when she's kidnapped) outside of them calling the mayor out, giving it a nice optimistic feel.
I just feel it lacks a real "Umph" to make it hit higher than a 7/10 or 7.5/10 is all.
I will say, I loved kerfluffle's peg leg design though, and Tabitha was INCREDIBLE in this one.