You're not wrong.
Usually, that is my function.
But ask yourself this question: Was it the marketing department that performed (and continues to perform) its job to the point that you were attracted into this emotional attachment?
Or put it another way: If the marketing department had done its job exactly the same as it has, but this particular Starbucks was a grubby little shit-hole with burnt coffee, surly staff, and correspondingly poor service, would the attachment still exist?
I'm not saying that marketing doesn't have a valid role in a corporation, but I'm suspicious of professional marketers attempts to pretend that they are the (major) reason for a company's success in the marketplace, which is at least a little bit how this article reads.
"co-contributors to success" - that I can buy.