If you're not stupid with viruses and crap, know how to make your own computer, want to save money, etc...PCs are a great thing.
I have no problems with viruses, crashes, or anything else, and I've had the machine I'm typing on for almost three years now. Got 2 7800s, 4gbs RAM, etc, for almost $1000 even. Back then that was a steal. Of course, I put the crap together and the side stays off of it a lot and there are fans hanging in weird places and...well, you get the point.
I also go nuts with lighting and 4 DVD drives might be a bit much. But I LOVE that.
It's my baby, hardware is cheap (Thanks to resellerratings.), and I can upgrade so easily! Since I love gaming, it's the best place to be. I've used Macs a lot and one of my suitemates is a retarded fanboi. The OSes are great nowadays and the parts are usually good. They're just not for everyone.
I like my colors and gaudy fans and huge assortment of cases. I like to tinker and my room is the OR for my computer. I really enjoy that.
As for aesthetics, I'm not too much of a fan of Apple's stylings. I think a lot of people are, though, and that's great.
Oh, and the Mac vs. PC ads are some of the worst ones I've ever seen.