Honestly, “Where and Back Again” is one of the only season finales that doesn’t have multiple plots points that make me want to headdesk, no matter how much I liked them at the time. “Canterlot Wedding” had Cadance and Shining Armor from nowhere and Crysalis’s plan making no sense, “Twilight’s Kingdom” had Celestia being a massive moron, Twilight being the only character worth a damn, and Rainbow Power being a ugly anticlimax, “The Cutie Re-Mark” had Starlight’s terrible abortion of a backstory, “Magical Mystery Cure” had… too many issues to go into here.
“Best Night Ever” is the best of course.