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.
For me, it highly depends. Turn-based strategy games, I can easily play at a much lower framerate (30 is fine tbh though I always appreciate more). FPS-style games? 60 is a bare minimum, but 100+ is what I would consider to be enjoyable.