A lot of today's campaigns are based on optimum positioning but are totally ineffective - because they are dull, or badly constructed, or ineptly written. If nobody reads your advertisement or looks at your commercial, it doesn't do you much good to have the right positioning.
David OgilvyMost agencies run scared, most of the time. . . .Frightened people are powerless to produce good advertising. . . . If I were aclient, I would do everything in my power to emancipate my agencies from fear, even to the extent of giving them long-term contracts.
David Ogilvy