The problem is defining disorder. Most of us experience a low degree of symptoms associated with ADHD, such as having difficulty focusing attention, becoming bored after a few minutes and being easily distracted source, the majority of people are not diagnosed with ADHD.
By definition, a disorder is "an ailment that affects the function of mind or body", which cycles with the definition of an ailment, which is "a physical or mental disorder" according to Webster's New Millennium Dictionary of English.
According to Encyclopedia Britannica, 2008, an ailment is a harmful deviation from the normal structural or functional state of an organism. A diseased organism commonly exhibits signs or symptoms indicative of its abnormal state. Thus, the normal condition of an organism must be understood in order to recognize the hallmarks of disease. Nevertheless, a sharp demarcation between disease and health is not always apparent.
Expanding on the previous sentence, humans have differing personalities. Where do you draw the line on what is abnormal? Obviously if say 30% of people are getting diagnosed with a disorder, the disnoses are wrong since 30% of the population is too large a number to be considered abnormal.
Personaly I believe that too many people are misdiagnosed with ADHD and although medicine has been proven to help control the temperament of people with ADHD or those with traits associated with ADHD, some children are simply being given too much leeway in their behavior without consequences by using the diagnosis as a defence. I'm sure many of you would agree that a child shouldn't be brought up to act without thinking of the consequences. Medicine may be used to help with managing someone's personality but one must be given opportunity to learn to control their own personalities without relying on just medicine like most of us do.