I like dukemichaels definition,it speaks to taking responsibility for your own results.
Any definition of greatness has to include some basis of measurement,the question wasn't what makes a great bowhunting ambassador,it was what makes a great bowhunter.
You can be a great hunter and be a miserable sob.The hunters I most respect are the ones for whom the entire experience comes from passion,and the ones who consistently kill the most challenging animals in their area.In addition to that if they are generous with their time and experience they are just that much more respected!