It was a mediocre episode that relied too much on weird slapstick than it did on what the show does best, which is character interaction. The first half was okay, and the train scene is really good, but it all goes downhill after that.
I also think most people were expecting an Applejack episode, something she really needed. Instead we got this weird Dash/Pinkie episode with a few buffalo mixed in.
And the pie fight scene was pretty dumb, not gonna lie.