Steven Poole in The Guardian:
Gladwell is a brilliant salesman for a certain kind of cognitive drug. He tells his readers that everything they thought they knew about a subject is wrong, and then delivers what is presented as a counterintuitive discovery but is actually a bromide of familiar clichés. The reader is thus led on a pleasant quasi-intellectual tour, to be reassured at the end that a flavour of folksy wisdom was right all along. Little things really can make a big difference; trusting your gut can be better than overthinking; successful people work hard.
The art here lies in making the platitudinous conclusion seem like a revelatory place to end up, after one has enjoyed the colourful “stories” about carefully described plucky individuals with certain hairstyles and particular kinds of trousers. (Actual quote: “He is a tall young man with carefully combed dark-brown hair and neatly pressed khakis.”) Such books must thus be constructed with a certain suspenseful cunning. Gladwell likes first to tell an apparently convincing story and then declare that it’s not true, like a magician pulling an empty hat out of a rabbit. Thus does his book begin, relaying the standard version of David and Goliath – plucky shepherd defeating fearsome giant with fortunately slung pebble – and then announcing that “almost everything about it is wrong”.