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Marketing people know what they are doing and it's more than common sense(they go to college for it after all).
That doesn't mean they're any good at it. I remember having to take a foundation in management, accounting and in safety - it's mostly common sense (of course, it still has to occur to you) and I felt thoroughly patronised. Of course, there are special tricks, new trends etc. to take account of, but this comes from people's innovative nature and their ingenuity, not from some cobbled together college / university module - most of what you'd learn there is the old "tried and true" methods - useful, sure, but not really going to rock the boat, eh?