Ok, so your opinion of smugness seems to be down to the characters. If you don't like them, you don't like them, although I personally think they're hilarious (new series of Peep Show Fri 13th April btw!)
There's a difference between rubbishing another's product in a crude way and pointing out its flaws in an amusing, witty way.
I assume you don't like standup, since most of that is along a similar vein!
Well, they do actually. When consumers are so used to Windows, you can't tell them "Mac's are better for X, Y and Z" because they'll just say "so what, I can do that on my PC anyway".
Point out the flaws of what they're using at the moment, and push them away from the competing product. And with there being so much spyware, malware and virus stuff in the media nowadays, it's a perfect time to capitalise.
Look at how MS are promoting Vista - "the wow starts now" and the "most secure Windows yet". We've heard it all before, which is why most people are sticking with XP until they buy a new computer.