Given some of the previous episodes, I might agree. Actually, given Rarity's prominence in this and the last season, I think it would have been better if another character had gone with Pinkie. For example, Rainbow Dash. Even though it meant she'd be out of her element given the city location, it might have made sense. She's proved to be a conformist with the Wonderbolts and she the type to rush to change things in the restaurant to quickly solve the problem as she sees it. That's my own opinion though.
Pinkie sucks plate.
Also, the return of Oinky Pie was much appreciated.