Radiohead has put out 9 albums in 18 years and not one of them was bad and almost all of them were amazing.

Paul Thomas Anderson has made 5 brilliant films over 15 years without a single slip up. Christopher Nolan's made 7 in 12 years to the same effect.

Stanley Kubrick made 13 films over a period of 46 years and they were all as close to perfect as a filmmaker could ever get.

I'm not saying everyone should be held to the standards of Radiohead and Kubrick, I'm just saying, it happens.