Someone once told me that coaching at a high youth level is a great job, as long as you don't mind having a bull's eye painted on your back.
The thing about baseball is, everyone's an expert in their own minds. And parents are typically unkind, biased and otherwise terrible towards coaches.
That being said, don't let anyone tell you there aren't bad coaches out there. There are. So if someone can give you concrete examples of a coach's incompetence, you might want to consider the possibility that he has indeed been saddled with one of the bad apples.