Abysmal marketing gets the entire blame for Macs tiny market share. It's 25 years of poor marketing that's killing them.
No, the Mac advertising doesn't stink, it's merely a) the wrong approach and b) nonexistent. And advertising isn't the same as marketing.
Apple Mac ads are stylish, clever, and say nothing. They don't say what the computer does, they don't say how it is better, they don't say anything except Macs are cool, Apple is cool, Macs will blow your mind, blow you away. This is utterly wrong. Apple already has the cool. The ads should NOT mention the cool. They should talk about functionality, reliability, completeness, ease of use, SECURITY, INTUITIVENESS, COMPATIBILITY, VALUE.
To a businessman, cool=toy, cool=flimsy, cool=style over substance, cool=expensive gloss. These things are fantastic general business tools and no one knows it. They will help you get your WORK DONE.
These things are not toys, they are not artsy-fartsy, they are not overpriced. STOP making ads that say this. Make ads that show people accomplishing things, and I don't mean making a home movie. Making a business document, a resume, moving seamlessly between PC and Mac, doing finances, presentations, doing things people mistakenly think it CAN'T.
Some of the print ads are more on target. Specs. Uses. Comparison. Value. Do some of that on TV for God's sake. Make it look like the thing can really DO something.
And take a tack from recent political campaigns. Marketing should be responsive to errors made in public by others. We have all seen TONS of times when a pundit, an ad, a reviewer says something that is outright factually wrong. CORRECT IT. Get in there and make sure these opinion leaders tell the truth. Let them have any opinions they want, that will eventually take care of itself, but every time a fact is wrong, get in there and correct it, right away. There is nothing wrong with the product, but misconceptions about it are rampant. Fix 'em!