I think if I were not already interested in My Little Pony: Friendship Is Magic, this teaser would not make me change my mind.

That's a problem because a teaser is supposed to do exactly that!
It's as if this wasn't a show that's been around for six seasons and has a deep bench of cool locations and recognizable characters to showcase. Like, if you were to imagine a trailer that shows off all of the strengths of the cartoon, ponies saying "Whee!" while zipping at high speeds over a white background is pretty much the opposite of that.
Come on, fellas, this is a movie about a cartoon about a toy line, I expect the
commercials to be good at least.

E: Oh, it's not actually a white background, I just remembered it that way