For me, anything 25 FPS or higher is 100% fine and I’ll be enjoying my time. I never play competitive online shooter games ever, though. All single player ones like GOW and the likes. I game on a 60 Hz 4k monitor. GPU is AMD RX 6600 alongside Ryzen 7 5700G and 32GB RAM. My games are set to meduim most of the time at 4k. Demanding titles are on low. Surprisingly, GOW and GOW Ragnarok are both set to ultra and I still get around 40ish FPS.
Depends on the game, but also the context.
Maybe this has changed since I’ve upgraded my gaming specs but I used to average 14 FPS on Kerbal Space Program and had a great time with it, docking is a nightmare at that frame rate but otherwise it’s more than playable.
Back in my poverty gaming days I 100%-ed a pirated The Simpsons Hit and Run with potato graphics at slide show speeds, I’m talking like multiple seconds per frame with around 80% frame droppage.
Nowadays I just care that it looks decent and runs smoothly for the games I play, which is mostly Civilization and Stellaris