Interesting thread, but I think if people are going to compare PCs to Macs, they have to be similar types of computers. The OP is right in saying you can't compare a PC laptop with an Intel GPU or a lower resolution screen than any of the macbooks, because they are in different leagues.
If a switcher is considering a mac, they would compare it to a PC with the closest specs. If for the same price a similarly spec'd PC has a lower resolution screen, then the mac is clearly better on that front, so I don't think people here should be arguing that they don't WANT a certain spec, because that's not the point. The point is, which system gives you the most for that price.
Another thing to consider is that the Mac is a premium product and puts the user experience first, rather than raw specs, as the OP rightly pointed out. Obviously the OS is most important here, but in terms of hardware, things that enhance the user experience are not merely specs. Instead, on a macbook pro these things would be the backlit keyboard, unibody, and screen (including it's high quality, it's light sensor which adjusts brightness depending on ambient light, etc.). For Apple, the user experience comes before raw specs, and as so many people have noted, typical PC makers sell machines with the best components they can get, with usually shoddy cases. It would be more fair to compare Macs with other premium PC makers, as Apple don't compete in the bargain PC market, and I think some people neglect this. It would be more fair because other premium PC makers like Sony also design their computers to stand out in ways beyond their spec list.
Finally, If you're going to compare anything to the iMac, it would have to be another all-in-one PC, as these are the only similar desktops available.