1. Accuracy
2. Accuracy
3. Accuracy
I have learnt to control ball pretty well, I know some rules on some games inside out, can nudge but everytime I miss a shot, ball is out of control, at risk of a drain.
Not only is shot accuracy number 1, it's the hardest to learn and improve.
I know if I had the shot accuracy of the best players, I would be a half decent player. But, if you keep missing a certain shot, you are going to drain way sooner.