Problem is they acknowledge Apple as a big threat with all this focus on a competitor. Same with the Scroogled ads and their Google obsession. Obsess about your own products. Like your competitors. Apple killed off the "PC guy" a long time ago now. For a reason.
I completely agree.
I think the Mac vs PC ads (if that's what you have in mind) were really funny in most of the cases/episodes. And they were required to get people familiar with the Mac - thus they aired for so long. Apple had to build/rebuild their image and to get people to know their products. Comparing Macs to Windows PC allowed Apple to easily showcase Mac's benefits. With "Mac vs PC" they'd shown people that Macs are better, simpler, more friendly PCs and there's nothing to be afraid of. Cause, let's be honest, people don't like change. My mother was terrified of OSX at first, it didn't feel familiar; even though she didnt understand 90% of the messages that Windows was throwing at her. But she's gotten used to Mac fast, because it's simply put simpler and allows her to do same things she did on her Windows PC and she can even modify the settings, preferences and such on her own
And thats what the "Mac vs PC" ads told customers they can run all their favorite software (Office

on Macs, while not being afraid of viruses, bloatware and Vista

Since they were equal (same) products the message was simple: Mac and Windows do the same things, but Mac does them better, easier, faster etc.
In the end: Apple improved their Mac sales and I'm sure those ads helped a bit. After establishing the product, the Mac vs PC campaign was needed no more.
Microsoft is doing the same thing - though the ads aren't as good IMHO.
"Mac vs PC" were more sympathetic towards Windows; both were personified + it seemed that Mac really cared about the "poor" PC.
The problem with the Surface and the recent Nokia 2520 ads is that they focus too much on the iPad - i.e. in the Nokia ad you see the Nokia for like 10 seconds. Everybody knows Windows, most people use it or have used theyre not afraid of Windows, theyre not afraid of getting the Surface - they know what's a tablet, they know what's a laptop. But Microsoft havent told them why they should get Surface.
At the same time most people know iPad. They at least know how it looks like and how it operates. And the millions who bought it know its pros and cons by now. But they didn't switch to Surface after it came out. Therefore it's something about the product they don't like or MS didn't communicate it the right way. And now they're being lazy and going the same way that didnt work the first time around. And thats just stupid.
Because the Surface isn't a tablet - it's tablet/laptop. So maybe they should explain that to customers (better) and convince them that THEY NEED the Surface and not that THEY DON'T NEED THE iPad. Because, obviously, people tend to need/want the iPad - despite it's shortocmings, no USB port etc.