I think Sony deserves some criticism. Studios like Bluepoint, Bend, and Naughty Dog could have been managed better — all of them were affected by the live-service (GAAS) strategy.
On the other hand, Insomniac is about to deliver four or more games for the PS5. Housemarque was acquired, and their production value level increased significantly with Returnal and now Saros. Team Asobi made one of the most awarded game in recent years, and honestly, Astro Bot is well above anything Japan Studio produced on its own in the past decade.
So, what I see is this: they made mistakes on one side but got it right on the other.
Now, saying this is the worst PlayStation console generation because of the first-party output doesn't make much sense. On PS1 and PS2, the most impactful games were mostly third-party. On PS3, quality was solid, but things only truly improved around the middle of the PS4 generation.
Anyway, everyone is entitled to their opinion. Personally, I think Sony can do better, but I also find it unfair to look at a publisher that delivered Gran Turismo 7, God of War Ragnarök, Returnal, Ratchet & Clank: Rift Apart, Death Stranding 2, Helldivers 2, Astro Bot, and Ghost of Yotei in the past few years — and claim they somehow released "too few games." Sony's level of quality and consistency remains quite unique.