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Measuring code quality with Wily

So far, we've figured out how to keep code formatted, but is this the only factor when it comes to code quality? Of course not; in fact, there are plenty of abstract metrics to take into consideration when it comes to the quality of code, such as the following:

• Lines of code (the fewer lines there are, the fewer bugs there will be).
• Cyclomatic complexity, which counts the number of logical branches in the code; for each if/else loop, or another indentation block, complexity grows by one. 
• Maintainability index—a measurement that mixes cyclomatic complexity, lines of code, and the number of variables.

But how are those metrics useful? Every task is different, and there are problems that require code that's ...