I think most people forget that most metrics are easy to hack and all metrics are hackable (yes, even if you use math & science). So the only rational thing to do is be aware and acknowledge the limitations of your metric and be open about that and what context they operate under. If you aren't aware of the underlying assumptions, your metric is borderline useless. It's like the old saying "there's two types of code: those with bugs and those that no one uses." All systems are buggy and if you aren't looking for them you'll get bit.

And in great irony, it is why metrics are the downfall of any meritocracy.