I recently came across a short film called Truth in Advertising, which is a major rip on the way marketing campaigns are developed. Everyone in the process - from the VP of Marketing and the Brand Manager on the client side, to the copywriter, art director and account director on the agency side - is equally skewered.
Do yourself a favor. Take 10 minutes or so to watch this video that shows each player actually speaking what they're thinking in a particular situation
FYI, I've chosen to simply feature a link rather than to embed the YouTube video itself because it contains some rather graphic language and this is, after all, a family blog.