When you are sizing up a short game shot you have to understand what constitutes a good outcome. What we are really trying to do is get the ball close enough to the hole, so that we have a good chance of making the putt.
When you compare the putting statisitcs of pro and amatuer golfers, its no surprise that the pros putt considerably better than the avergae player. However even tour players chances of making putt reduce once they get outside of 8ft.
The real test of your short game success is getting your ball within 8ft of the hole to give the best chanceof making the putt.