Actually, Macs do work pretty nicely- it's just that that doesn't get you much.
It's sort of the same thing as comparing those giant colorful lego blocks with twelve tons of scrap and a welding torch- sure, the play blocks are relatively easy to learn to use, and you're not so likely to cut or burn yourself using them, but you can't make a lot with them, and you don't have a lot of options- you can put the red one on top of the green one, or vice versa, or put one on top of the other so that they only link by two pegs. Whereas welding's nasty, dirty, dangerous work (well, the analogy's hyperbolic there, the biggest "danger" can be averted by burning a backup CD), but you can do practically anything with it, control the size, shape, and configuration of the parts you use, and in the end have a lot more fun anyway. Macs are great if you don't need much- you're just gonna Photoshop a little or maybe word process- or if you didn't really grow up a nerd and hence aren't comfortable with interfaces that are less than user friendly. PCs, and particularly Linux/Unix PCs, are for serious computer users.
Honestly, I'd recommend most people use a Mac- after all, hardly anybody makes use of their computer beyond very basic functions such as typing up papers and gaming, and it would mean I wouldn't be flooded with regular whines about how someone reformatted their hard disk and now for some reason can't find any of their files. They're pretty simple. Personally, there's a special place in my heart for the little bastards, and it's in the middle of where all the hate goes, but then, that's me, and while I can't do most of what I do on my PCs on a Mac nearly so efficiently, the stuff I (and many of the graphics people here) do represents less than the 1% of what computers are used for.
Yeah, it's nice and cool and l33t and all to have a computer that can do practically ****ing anything and that you can take apart and put together on the most elemental stage (and that has a friggin' FLOPPY DRIVE!!! Urgh. Damn them.), but all in all the whole computer-potential-equals-dick-size thing is pretty damn immature and lame now, and it's much more intelligent and capable a move to spend money on a computer that does what you need it to do, and does it well. Me, I need a computer I can beat up on, modify heavily, install all sorts of freaky **** on, and generally fiddle with without getting some big colorful menu giving me every option but the very basic one I want to use.
This in no way means I don't have a deep, seething hatred of all things Apple, it just means that even the epitome of evil has its uses at times.