I used to work at a large telco, and had daily dealings with Marketing.
It was incredible to see how important they thought they were, and how every single aspect of the entire company had to be about Marketing. Even when it very clearly made the product shitter and pissed off customers and was a total disaster, they would increase the number of ads, increase the BS customers had to listen to when calling in and make the website a nightmare to navigate.
Even when external experts hired specifically to re-design the website for millions of dollars said point blank their decisions were horrific and were driving customers away, marketing said "We are Marketing, do as we say".
Everyday working with them made me think of that Steve Jobs video where he talks about a company being doomed when the marketing folks take over.
(Incidentally, the VP of Marketing is now the CEO, so yeah)