The problem I have with all of Gladwell's works (Blink, Tipping Point, etc.) is that his theories are overly simplistic. They are formulated at the cocktail party level, they make interesting stories but they are not sufficiently well thought out or detailed to actually make testable predictions or be useful in any practical sense. This is a shame because some of the things he studies (especially in Blink) is potentially very important and well done research could have wide ranging positive influence.

Ultimately though Gladwell proves himself as not a scientist, and seemingly content to just write interesting stories rather than to do the less glamorous work of fleshing out his ideas into something of practical value.