To be clear, I'm not talking about code style (easily objectively quantifiable) or bad code (also easily objectively quantifiable), but architecture/design. This can be things like which folder an interface belongs in, where to put a method in a parent/child relationship that touches both, when to use value objects vs. scalars, when to break functionality into another service/library, which methods are allowed to call which methods, which classes must be injected vs. instantiated, etc.