Warning: Minor Spoilers Ahead!
Story-wise, it's pretty solid too. Basically, Sunset Shimmer, the disgraced former student of Celestia, steals the Element of Magic, and escapes into the human world with it through an enchanted mirror. As the other Elements are powerless without it, it's up to Twilight to go and recover it. So the main reason Shimmer appeared to be so hostile to Twilight isn't just because she's the stereotypical "alpha female" character, but rather because she knows who Twilight is, and why she's there. The main conflict is basically that Twi needs to get the big crown thingy back before Shimmer can use it on the night of the thirtieth moon to become all-powerful, and overthrow Celestia and Luna back in Equestria. Without giving away too much, there are even some of the "magical girl" elements I was hoping for ever since I first heard about EQG, complete with flashy transformation sequences. ^_^
So, I know a lot of people were probably worried about "Brad", that potential love interest for Twilight from the trailers... Well, I decided before watching it that if the movie ever went as far as having them kiss, or otherwise declare their undying love for each other or anything like that, then I would probably wash my hands of this movie and pretend it never happened. Fortunately, it never came to that. In fact, it never advanced beyond some awkward blushing here and there. Though I suppose even this much might be going too far for some Bronies, you'll have to decide that for yourself. But personally, I thought it was a relatively minor element, and mostly inconsequential to the movie's plot as a whole. And in case you're curious, his real name is Flash Sentry.
Oh, and of course were also a lot of funny scenes with Twilight struggling to become accustomed to this new world she was in. She really freaked out when she found herself suddenly transformed into some weird furless two-legged creature, with these freakish grabby appendages in place of hooves. XD It was also pretty funny seeing her struggling to grasp the concept of computers. ("Maybe this world does have some magic after all?") lol
Overall, I'd say it was a pretty solid movie, well worth the price of admission. Check it out if you can, it'd be a shame to miss out on it. I wonder if those rumors of a follow-up TV series are true... Either way, I'ma see if I can't pick up the DVD as soon as it comes out.
...Still no interest in the dolls though, sorry... [link]
Oh, and I can now confirm that this brief scene: [link] of Twilight having trouble with her new wings is actually from Equestria Girls, and not season four.