What puzzles me is why Mac users think Windows users are eternally struggling with viruses. It's such a tired, old argument. I've got a free anti-virus package installed with minimal footprint and I don't download dodgey files, clicks dodgey links or accept dodgey attachments. And lo and behold, the Windows experience is as equally virus free as any Mac experience.
If you're a gamer, the first thing you have to do to a Mac is install Windows to be in with any sort of chance of playing your entire collection. And then switching between OSs to do different tasks is a real chore, so you end up sticking with running Windows most of the time anyway, which means you might as well have just bought a Windows PC to begin with. And the really tired old argument that you have an Xbox360/PlayStation/whatever to play games on might apply to some people, but certainly doesn't apply to everyone. Show me The Sims 2, Sim City 4, The Movies, Rollercoaster Tycoon, Railroads, etc, on a console, and I might agree with you that a console is a viable option for gaming.
Apple certainly has the edge in that the entire package is designed and made by themselves, but if you buy your PC from a manufacturer rather than building it yourself, you do get a warranty on the entire package, not just the hardware itself. Apple shops are so few and far between in the UK that actually being able to pop in a see an Apple Genius is probably out of the question for the majority of the population anyway. It's a good example of how Apple give priorty to their native country. I suspect they would have shops in just about every major city in the UK if they thought the business was there.
The easier to use point is very very subjective indeed. I've been a Windows user for a long time now, and when I tried my friends iMac it was anything but easier to use. In fact, lots of things seemed totally backward and very difficult to do in comparison to a Windows PC! File and folder sharing on OSX seemed to be a very long winded task in comparison to the one or 2 clicks required in Windows, and don't even get me started on printer sharing. Needless to say, 4 months after she got the Mac, my friend *still* hasn't managed to get it to share the printer. Apparently we need some sort of special printer driver which isn't provided on the Canon CD, or on the Canon website, and is anything but easy to find, install and configure. On a Windows PC, you right click the printer, choose 'sharing' and off you go, printer is shared and accessible by all PCs on the network. I wish the same could be said of the Mac, but it simply is not true. We also managed to get a CD stuck in the drive, and the Mac wouldn't boot, and with no physical eject button, we were stumped for about 10 minutes until we Google a solution. What the Mac does do nicely is play well with just about any bit of hardware you plug in. However, with Vista, I think Windows has caught up a lot in that respect, as it has a vast library of drivers included with it, so most things install and work straight away on Vista too. But certainly, the Mac seemed easier in that respect.
The Mac is a bit quicker in that it boots up faster, but I feel that 'sleep' mode on Vista has also closed that gap since you can get Vista back up and running within a second or two too. The actual operational speed of opening programs etc etc, was no different between the two. OSX looks a bit flashier with its bling effects (always good!).
The Mac is far easier to setup physically than a PC. But unless you plan on moving it around a lot, this is less of a striking advantage, and more of an occassional convenience. The appearance may appeal to some and not to others. You can of course get visually appealing Windows PCs too, so there's no way one could be a 'winner' as the whole are is so subjective. PCs, more often than not, have the ability to be upgraded with new components more comprehensively than a Mac. Comparitavely, Mac hardware has a longer life due to the requirements of the software not changing as quickly. Building and tinkering with hardware is a hobby of mine, so I *have* to be able to build my own machine from scratch, and swap out of part I desire (this is exactly why Macs weren't designed for me!). If you're happy to live with the set hardware, and forgo gaming when the graphics card reaches EOL (which is usually very quick!) then the Mac is fine.