S-tier
I think Naughty Dog is S-tier even objectively speaking, whether one likes their story and design choices or not. The quality and polish in everything is top notch compared to anything that's out there.
Santa Monica hoisted themselves into this category with the new GoW, and so did Sucker Punch with Tsushima.
A-tier
Insomniac's Spider-Man is pretty flawless as well, but would they be able to do as good with an IP and a concept of their own instead of building around a popular superhero?
Guerrilla is also on this tier, they are almost at S but I feel just a little more depth is needed in character building and fleshing out the world. Maybe the new horizon will accomplish that.
I would also put Polyphony here, technically you can't do a driving game much prettier but very little changes between iterations other than a graphical update. Basically the same races, same tracks and so on. Feels a little repetitive, a bit like the big sports games with annual updates.
B-tier
Bend. After the Syphon filter series, they kind of went low profile and then suddenly came out with Days Gone, which I liked very much. With their next game, they could easily become A-tier, no doubt about it. A pity they didn't get to make a sequel for DG, making the concept even stronger would have been a straight shot to the next level for them.
C-tier
Others.
I'm sure the upper tiers should include some studios that I'm simply not familiar with, and I'm certainly forgetting a lot of stuff, but these were just off the top of my head.







