Not that I am great at it, however I did try and explain it to my oldest boy, as he could not understand how his younger brother was beating him at times. Oldest shoots almost all A's, but takes his time (still fast though). Younger one shoots 50% A's, and then a lot of C's and some D's. However, he shoots like a house on fire. Overall the oldest wins more stages, but they are close a lot of the time. Competitive Teenagers!! I did get through to him some, and he sped up until he was at 90% A's, and that is what it took.
It is a "game", and there are lots of "rules" on how to play the game to win! At this point, just go shoot!