What do you think about the fact that the creator of the term "ADHD," Dr. Leon Eisenberg, said that ADHD is vastly over diagnosed?

Interesting article on Snopes about this. The rumor that made it to Snopes was that he said “ADHD is a fictitious disease.” That’s not quite what said though, and Snopes gave it a “partially true” rating.
Dr. Eisenberg said, “The genetic predisposition to ADHD is completely over rated.”
Reading the article it sounds like he’s saying that most of the time doctors decide a “problem child” has ADHD and stops there. They don’t bother looking for any other possible cause, such as home life, lack of discipline, etc.