Nope. Pathologising the normal range of human behavior is a popular activity of neurotic western privileged people. Or whatever the mental illness that's trending at the moment.
Here's the science behind ADHD: Functional MRI allows us to image actual brain activity. And there are clear differences between the brains of those diagnosed with ADHD and those diagnosed without (and yes, they do these studies blind, so researchers can't be biased).
And more recently they have found that stimulants such as methylphenidate (aka Ritalin) and others actually reverse these changes. Here is a recent study, plus a metareview (which compared several such studies):
http://www.ncbi.nlm.nih.gov/pubmed/23247506 http://www.ncbi.nlm.nih.gov/pubmed/23660970
Of course, we could still have an interesting philosophical discussion about what we label a medical condition and what are variations of normal that nevertheless have a biological basis. Clearly, ADHD is not on par with debilitating psychiatric conditions such as schizophrenia or a bipolar manic episode.
But ADHD can cause functional impairment in school, jobs, and personal relationships; it can lead to decreased happiness and satisfaction in life (and not only for the person affected, but also their families, partners, and colleagues); there are clear neurophysiological differences underlying it; and we have treatments that can make an important difference. So why not use them?
And as for the big drug companies? Most of the ADHD drugs are generic these days, so they don't profit.
What I am being sarcastic about, is this completely unrelated thing that people on the internet do, this game of "Guess the mental illness", which usually isn't very helpful.
That does not change the fact that ADHD is a dysfunction of the brain where the regulation of Dopamin and/or Serotonin does not meet the requirements of the environment.
I think it rather tells us something about the diagnosis which isn't handled very carefully in many cases, especially for children. A proper long term validation of symptoms and evaluation of treatment methods should be a starting point, not a standardized set of questions and a recipe at the end of the session. Behavioral therapy can sometimes be as effective as drug use but it is not even considered most of the time.
Without extended knowledge of the topic the public almost has to think that ADHD is a fraud. It's nothing one can see as a broken leg and the media only reports about Fraud and instant subscriptions to children that might not even have ADHD. Sometimes even MD's claim it's not a real disease because of these reasons. It's not their field and what they hear about it only makes them suspicious. There is so much misinformation about the topic it's just sad.
[1] http://www.naturalnews.com/019404_psychiatry_psychiatric_dru... ( sorry couldn't find a better english source )
Regardless of contrasts with "more serious" psychological or physical illness, ADHD is debilitating without treatment and destroys the suffer's quality of life.