I see two related problems:
1. What length would be the point of reference for good vs. bad putting?
2. I make one lucky 50 footer, along with 18 tap-ins one day, and shoot a million, but have 70 feet of made putts. Another day, I keep hitting it close and 5 birdies and 50 feet of made putts and a great score. A third day, I miss every green, but in the right places, chip like a crazy man, and have 30 feet of made putts and a great score. So which was the best putting day?