I would be do. How can you blame him. The game was fucking awesome but obviously rushed by Sony to release because of how bad the framerate was at launch. There literally isn't anything about Days Gone that's different in something like Ghost of Tsushima. Both are open world, very immersive, great for exploration and have fun combat.
"Rushed by Sony"
Do you see Sony rushing other first party studios to deliver their games?
They gave Bond
6 fucking years. Maybe they needed more time? 8 years?
Wanna compare with GoT? It also took 6 years to develop. But it launched at a much better shape, very polished, has way better pacing, way better exploration with better rewards, way better combat and etc.
They fucked up. Should have polished that turd much more. And now the man is complaining about his own failure.
If you arent able to make a polished game of that size, then its on you to blame. Make something of a smaller scope, more focused, then you wont see your IP being bad reviewed at launch and killed afterwards.
It came out at a time where Sony studios were firing in all cylinders, so it was that much more aparent how unpolished it was compared to other Sony releases.