I know everyone who reads this site is on a quest to shoot lower scores. A lot of it has to do with strategy, the mental game, the way you practice, and a few other categories. However, you can't escape what is going on at impact.
This video from Adam Young is a bit of an eye-opener, and it shows the main two reasons golfers are not striking the ball correctly.
If you are interested in figuring out how to fix these common flaws I recommend checking out The Strike Plan. For a limited time, Practical Golf readers can receive 20% off with coupon code PRCTLGLF. It's one of the best online courses I have seen when it comes to ball striking, you can read my full review here.