I get accused of being a Mac fanboy on occasion. I get friends occasionally go off on how they hate macs (Hi Craig).
I just got a brand new untouched. HP for the office. Booted it up. Have now (2 hours later) have finished installing over 100 updates, and rebooting 4 times. Let me add that's after a few reboots and updating the updating software first. Also I have a box in the corner that keeps flashing and telling me my system might be at risk and my AntiVirus software is out of date. This is a brand new machine.
Granted Vista might be a better out of the box experience, but I've yet to hear good reports on vista, especially on inexpensive hardware.
You can argue pros and cons of machines and their are fair points on both sides. Although less of an argument when you take away familiarity (people generally like what they are used too).
However you cannot, in no way argue that a PC has a better out of the box experience.
Hell you'd struggle to argue that it has anything but a mediocre one. I'd even go so far as to say atrocious. It's border line the same experience as buying a new cordless drill. Which is why people generally view PCs as tools and Macs as something more.