Breezification
First off it was pretty much no point in that scene happening as it did nothing to change up the plot. We could've removed that scene entirely and still get the same end results.
Secondly, it was only for a marketing ploy which is expected from Hasbro, but in my own opinion it is unneeded (they couldn't even wait till the Rainbow Powered Ponies came out)
Thirdly it felt like a deus ex machinia that Twilight randomly pulled out of her horn.
Granted I actually like the idea of transformation and transforming the mane 6 into different animals. I actually, even liked Rainbow Dash's comment towards Twilight to turn her into a GriffGriffin or even a dragon.
It just felt like the Breezification was unnecessary and the transformation spell could be saved for a different episode.