This seems like a really dangerous way to expose yourself to a discrimination suit if you slip up in your feedback, or the candidate interprets it the wrong way. And they will.

Would HR advise you to give this kind of feedback to someone you're terminating? Normally you say zero for this exact reason.

It's interesting the legal differences between Australia and where you are from (I presume USA). In Australia, there is very little risk of lawsuits. When terminating someone, you have to have give a reason for termination (and usually warnings before hand which have to have reasons as well).

Be the change you want to see in this world.