Back on topic for a moment, speaking of bell curves...
Keep in mind that while doctors fall on a bell curve (a.k.a. Gaussian Distribution) in terms of "quality", patients too fall on a bell curve in terms of temperament, irritability, cordiality, interest in following treatment instructions, and on and on.
The average PCP has more than 2000 patients in their active practice. So, while the vast majority may be quite happy and satisfied with their physician, there will be a "tail" on the curve at one end with people that aren't ever happy, no matter the doctor.
And it is those that tend to make the most noise.
Now for balance, understand I don't mean to imply that anyone complaining is just a whiner, nor that their complaints are illegitimate. Just want to provide a complete perspective.