Majority of everything is always mediocre at best. There is no absolute value in those things, they always get pitched against each other. Something mediocre today, could have been a masterpiece some decades ago. A masterpiece from decades ago could be hot garbage today. Those things are a constantly moving target and will always shift. People will just adapt their taste and figure out some new random rules to say why something was yesterday a masterpiece and became today mediocre and so on.