^All Apple do with their product line is make it simpler for people to choose. You want a simple home laptop ? There's the MacBook. Already got a monitor, keyboard and mouse ? MacMini.
A Mac will do exactly what you need it to do, and the chances are it will already be able to do it when you switch it on for the first time.
The problem for me is that I've never seen any figures to actually back this up. Yes, you hear about people having problems with their Vista machines but then there's also people experiencing problems with their Mac machines.
I think part of the preconception of Macs being better than PCs still stems from a few years ago.
Don't get me wrong. I certainly agree that Macs are good. But I think Vista machines are good as well. There really isn't that much of a difference IMHO.
Plus you've still got a substantially larger software library to choose from on the PC. Granted, that's because the user base is so huge, but there you are.
They're not saying much about OS X, but they're saying that Vista still has problems over a year later, they say it crashes, is loosing market share; implying that they don't and are therefore better. I get the stuff about it being the cool thing and such, they've built a good image for them self and are doing very well because of it.
I think one thing not to forget is that OS X IIRC had its own share of problems when it was first released despite the fact that the Mac is a far more closed system. Fact is, today's operating systems are very complex and will have problems somewhere along the line.
Don't get me wrong here: Although I use Vista every day and think it's a good OS, it's not the step forward I would have liked. They've made some improvements, no doubt (it's safer and more stable than XP, for example), but it could and should have been so much more.
However, I really don't think there's that much of a difference between it and OS X (which I've also used). OS X is sleeker and smarter in some parts of the UI but it's also less flexible in what it will let you do. Granted, this doesn't affect most users but some it will.
I'm not really sure about the market share. I know Vista wasn't doing as well in the beginning, and I know company's have been slow to adopt it. However, last time I checked, most new computers now ship with Vista, and companies have always been slow to upgrade for various reasons.
In any case, I think it's safe that the Mac's market share is still considerably smaller and will remain that way for the foreseeable future. As a consequence, I'm not really surprised that Apple 'attacks' Microsoft and not the other way around (granted, Zune vs. iPod is a different issue entirely

But still, I've really never seen any thing at all from Microsoft that flat out says "this is why Vista is a good product and you should use it". Apple say "Vista crashes, has problems and is un-cool; but OS X is very cool and doesn't have those problems". Might not be 100% true, but it's far better than just saying "we're here and can work for many people".
Is it really such a bad idea for an advert that just tells me why a product is better than others?
I certainly see what you mean. And I think this is a general problem in Microsoft. They have so many really, really great products that suffer mostly from the fact that they're not marketed properly (Office Groove is one such example).
Still, I think it's possible to see a message in the new ad and a statement as to the quality of Windows Vista (albeit without comparing it to another): Everyone can use a PC (i.e. it's simple to use) for whatever they need to use it for (i.e. it's flexible). I don't know. Maybe that's too subliminal or maybe I'm reading in too much, but that's what I took away from it anyway.
Actually, the fact that the Windows ad references but doesn't mention Macs can be seen as a mesage in itself. They just don't need to.