Good Hit vs. Bad Hit

How can you tell if a hit is good vs. bad? It can be difficult to determine at times, but here is a great clip from Bob Jewett showing how best to figure it out.
If you are aware of the knowledge in this video, but know someone who isn't, please forward it to them. (Special thanks "Dr. Dave" - David G. Alciatore, PhD, PE with the Department of Mechanical Engineering at Colorado State University for the link!) Let's keep the game on the table instead of arguing about it off it!
Watching the Cue Ball:

Watching Object Balls: