If it's consistent, I can live with 40ish and above, although I really prefer a locked 60. What I can't live with is inconsistency. Even if a game hangs around 40, it bugs the hell out of me for it to be 40, 55, 38, 60, etc.
if i can get between 50-60 is important! anything over i dont care, not bc the human eye can see over 60fps (which is false) I think 60 fps is nice and smooth
I think it matters the most, as just seeing beautiful pictures every second or so is unacceptable. As for how many FPS - for casual games I’m comfortable with 60+, with competitive games 300+.