Naughty Dog still the most prolific studio for Sony. At the end of the generation they will have launched three games. (And im not counting the year they spent working on TLOU Remastered) Thats more than any other first party studio. I know these games are established IP but is still amazing.
But it's equal or less than many studios last generation:
Naughty Dog: 4 - UC 1, 2, 3 and TLoU
Sucker Punch: 3 - Infamous 1, 2, Festival of Blood
Media Molecule: 3 - LittleBigPlanet 1, 2, and Tearaway
and...
Insomniac: 10 - Resistance 1, 2, 3, Ratchet & Clank ToD, QfB, aCiT, A4O, FFA, ITN, and Fuse
Plus, Ratchet & Clank was the only existing IP out of all of those.
I'm not discrediting Naughty Dog. They are the best in the business. But it's disappointing that they probably won't launch any new IP this generation. It'll be the first time since the PlayStation was introduced that they didn't create any new IP during a console cycle. And, sure, the PS3 cycle was longer, but a releasing 3 games has just been par for pretty much every past generation.