** SPOILERS **
Let's begin in a logical place, by showing the real Power Pony lineup from the comic...
... and the "Mane 6"
Twilight Sparkle Power Pony) tells a gathering feting the Power Ponies' success that the PPs' victory was due to "teamwork." Ladies and gentlemen, Our Heroes... jerks AND hypocrites!
I can see what Anderson was going for here -- a kind of Fantastic Four vibe -- but pulling that particular card out while playing the very first "trick"? The Power Ponies are supposed to be popular superheroes in Equestrian pop culture. If this is how they normally interact whenever they are off duty -- and, since this is the first time that we ourselves have seen the characters, I have no choice but to presume that it is S.O.P. for this bunch -- then I can't possibly imagine anypony (OK, I went there) ever learning to like the comic. Even the Fantastic Four are "a dysfunctional but loving family." Anderson's error lay in trying to create an existential crisis for the Power Ponies before they had even had an opportunity to face an external one.
The Power Ponies' main villains, mistakenly assuming that the PPs' success against them is due to simple cooperation, decide to beat the good gals at their own game and form a villain's cooperative. (They spend a good deal of time discussing the proper term for such an alliance. How very meta.) They wind up defeating and capturing the Power Ponies and, for good measure, transfer the PPs' powers to themselves. The transformation scene itself is quite impressive. Artist Ben Bates hadn't been seen since some of the earlier issues of the cancelled MICRO-SERIES. In the interim, he seems to have upped his game; his art maintains its liveliness without being quite so sketchy on the margins (especially when it comes to drawing background figures).
Rarity replacement, fixes up the villains' machine so that it will reverse the transformation process. (Even in a different context, there really IS nothing that mare can't do.) Things soon are "again as they were," with the villains captured and the Power Ponies thanking Humdrum for teaching them to act more like a real team.
The decision to make the Power Ponies bickerers from the off is arguably the biggest conceptual mistake that has been made to date in the handling of the entire IDW MLP:FIM franchise. Not only is it a terrible choice for an initial Power Pony adventure, but it may just compromise any Power Pony stories that may show up in the future, since said stories won't make any sense unless the Power Ponies build on what happened here and continue to learn lessons about friendship. In other words, any future Power Pony stories will almost have to parallel the development of the original My Little Pony series itself. That seems like a waste of a halfway-decent concept. I think that IDW would have been better off going the Super Friends route and simply treating these tales as light-hearted, cliche-tweaking romps, saving any unnecessary angst and character developments for the canonical show.