Problem is that when people have a problem with something, be it their OS, computer, television, relationship, etc. etc., they will complain about it. But when everything is working fine, they are not going to say "just wanted to let you guys know that everything is working fine", rather, they will be silent, since to them, everything is as they should be. People only speak when things are not "normal". And failing hardware is not normal. Hardware that works fine IS normal, so they will not speak.
What does this mean? It means that if we have 1000 computers, and 20 of those has some kind of problem we might have 15 people on the forum complaining about it. But we might not have a single user telling how everything works perfectly.
Does Apple have problems with their hardware? Sure! Show me a hardware-company that makes hardware that never has any problems, and I'll show you a company that doesn't really make any hardware at all. If you build something, there will be issues with the things you build.
While Apple has it's share of problems, it's not like this is a recent phenomena. DIdn't one of the first PowerBooks have a risk of going up in smoke? The TiBooks had flaking paint. One of the PowerMacs was so loud, it was nicknamed "Windtunnel-Powermac". Yes, Apple has some hardware-problems now. But they have had hardware-problems for as long as they have been making computers. And I bet that Apple's track-record is still among the best in the industry. IBM and their Thinkpads were equal, or maybe even a bit better, but I have heard that their quality has gone down since Lenovo-purchace. So it just might be that Apple makes the best laptops in the indsutry right now, and I bet that their desktops are among the best as well (quality-wise).