Pokémon Black/White was a great comeback after an incredibly boring generation of Pokémon games on the DS. Sadly, the franchise didn't recover from later stumbles.
Persona 5 is a masterpiece, and coming off the heels of the cringefest that was Persona 4, yeah, big step up.
Metroid: Samus Returns is maybe a minor return to form as it's not the best game it could've been, but coming from Other M and Federation Force (yikes), yeah, self-explanatory.
Also, I feel like mentioning Skyward Sword. It's not really a return to form, because Zelda games never stopped being great, but for a few years there the franchise had lost a bit of its golden touch. A couple of lackluster entries in Minish Cap and Phantom Hourglass. Spirit Tracks was good but flawed. Twilight Princess was quite good, but for 3D Zelda standards, a bit underwhelming still. Skyward Sword was the first Zelda in a while to feel legendary like the ones from before, in fact it's still the best game in the series, and the standard of quality has increased after its release.