I use a PC. Why? Because anything I would ever want to do on a mac, I can do much better on a PC because I learned how to use my computer and it's applications. Most people, when they buy their PC, do not go through the tours and walkthroughs that the thing offers upon first activation. What happens after that? Well they keep doing the wrong things, can't maintain it properly, use incompatible upgrades, overclock things poorly due to under descriptive online sources, surf research and get tons of viruses, and then when their PC takes a crap. It's obviously because the computer sucks. It's never the user's fault because obviously they know everything there is to know about computers, yet can only take it to some entrepreneur led freak at Best Buy when something goes wrong.
tl;dr: pcs and macs suck if the people who buy them are morons. Learn to use them properly or get off the internet.