"Would Mario be any more fun if you can see each and every pore and pimple on his face?"
More power doesnt have to mean more realism. More power means that you have more options on tap, and have to make less compromises. More particles, more dynamic lighting, larger maps, more enemies are all what comes with more power, not just more detail. Until we can simulate reality down the particle, more power will continue to add fidelity and depth to the experience. Saying its 'good enough' only shows that you have stopped trying to imagine more.