Comment by hashkb

Let's not throw the baby out with the bathwater. We can still measure how quickly new (average) developers become proficient, average team velocity over time, and a host of other metrics that tell us if we are increasing or decreasing the quality of our code over time. Ignoring it all because it's somewhat subjective is selfish and bad for your business.

Leave off the word "clean" or whatever... DO have metrics and don't ignore them. You have people on your team that make it easier for the others, and people who take their "wins" at the expense of their teammates' productivity.