Are you kidding?
For gamers, Macs are virtually worthless, but for design and video use, Macs are far and away superior to PCs. The problem with Macs is that you can get a really powerful computer, but it will frequently cost twice as much than a PC. PCs also are a LOT easier to hack--which is proved by this Safari hacking. No problems for Safari on Mac, but move it to PC and it's immediately hacked. OSX is a much, much, much better operating system than anything Windows has. It's no big secret that Vista is an attempt by Microsoft to emulate Mac's OSX system.
So in short, Macs are great for art, design and video work, are very hard to hack, and can be very powerful.
But PCs are cheaper, great for games, are much easier to hack and have a lot more ways to upgrade (both hardware AND software).
I have 3 PCs and a Mac, and I wouldn't have it any other way.