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.
30 is acceptable for most games but stuff where the gameplay is mainly the movement itself (platformer, racing, first person shooter) needs to hit 60. I could go lower than 30 for the visuals on a lot of games but that’s the threshold where the interface starts feeling unresponsive and that really gets to me.