The target audience for the commercials are people who are not particularly tech savvy and are disenchanted with Windows. The commercials are saying, "hay over here, you have another choice."

Now I agree that they are a bit over the top, they are funny, but I have to kind of agree with PhilC's point of view as well.

Me:
I own 4 PC's Running 3 flavors of Windows and Ubuntu and 2 Macs. My experience is about 90% windows, 9.9% Mac, .01% Linux. (Just because thats what I use and maintain at work.) AND I have run into problems with Windows and Mac and Linux over the years. It's just a fact of life.

I prefer Macs but I stopped a long time ago trying to convince people to use Macs. Its like arguing religion or politics. In the end you both leave pissed off and no one has changed their opinion. In fact it usually only serves to harden a persons existing opinion.