Middos, oddly enough, can also be a little subjective. Here is an example. A guy is a strong leader, self-assured, runs a business with seichel and confidence (not arrogance). His leadership ability is admired. A WOMAN does the very same thing – she is a tough cookie.
I have no love for Hillary Clinton. NONE. But from what I have heard on the news, what she did with her email account was also done by John Kerry (unless the reports really were grossly inaccurate), and there was no brouhaha over him. So I think that what is perceived as improper action (bad middah) by one, may not necessarily be viewed that way in someone else, who seems to get a pass.
And yes, there are CERTAIN traits that are inarguably good or bad middos.