When marketing goes wrong, it does not just go a little bit wrong, but a lot wrong - certainly if you are a large business or global leader.
Small companies, if they do not communicate their marketing message properly, only really loose out a little. Maybe they will experience a dip in sales equating to a few hundred or few thousand pounds - nothing life threatening but just irritating.
However if you are a large business, and your marketing/PR is angled wrong, then there are very serious problems. Customer confidence can go, you may loose your market share footing - or the brand could be shot down.
A recent article on the BBC website looks at some of the leading brands in the washing powder industry and how their marketing/PR is positioned.
Finding the right marketing agency is important really for any business of any size - however the higher you are up the ladder (in business terms) the further there is for you to fall should things go wrong.