Pseudo-science or not, Gladwell's work always incites discussion. This is, I believe, the real value of his work. Most people I know don't take his word as truth, but they love to use his anecdote's as seeds for delving into a subject further.

Besides, this type of bullshit is perfectly suited to starting random conversations with strangers. It's rememberable and entertaining and loosely intellectual. It doesn't alienate people based on their personal beliefs like religion or politics would. In the vast spectrum of bullshit out there, I think Gladwell might be the best kind.