I like to look not just at the code itself (simple measures such as nesting level and lemgth of method/function), but also at the frequency and correlation of f

I like to look not just at the code itself (simple measures such as nesting level and lemgth of method/function), but also at the frequency and correlation of file changes. Noticing that you often change the same files together is an indication of coupling that might be bad. You can also weight the code metric higher for files that change frequently and recently, because if it's an old file, or one that doesnt change much, the quality is probably good enough,