It's true that QC at Apple has gone down hill. I think, as is illustrated here, that it's most prevalent at the pro notebook level. I hope that it doesn't reach the pro desktop or server level (Yikes, BWhaler!)
I work at a school and see lots of Apple desktops. We are struggling with the whole eMac and bad capacitor issue that cropped up a few years ago. Some machines are just starting to give up the ghost now because of this. Thankfully Apple has an extended warranty issue on this so it's covered without a charge. This, alas, was not Apple's fault as it was an issue that also hit HP & Dell.
The white MacBooks have been solid and staff that have used PCs exclusively before this are very impressed by the quality of these computers and by the MacBook's display. But for all intents and purposes, this was a computer that was practically engineered from scratch and is the only computer right now in the Apple line that is new with the Intel transition.
The iMac has been a solid product. We have a number of these. Intel and G5. So far so good. I have an iMac G5 at home and I love it. Best computer/design Apple has ever made. I am interested in the rumors of a totally new design to see how they are going to improve it.
At work I have a Intel Mac mini Core Duo 1.83 for general usage and it has been solid. It's never been turned off in the 9 months I have had it unless there has been a power outage and I have only had to restart it once because of a Toast/iTunes conflict. The 20-inch CD it's hooked up to is fabulous. I would love to replace the Mac mini part with a Mac Pro, but I am not sure yet. I have to take care of some other important things in the budget right now, so that's a maybe.
I would love to get a MacBook Pro 17-inch Hi Res and not have to worry about staring at a poorly illuminated display. Or worse yet, some other malady that has yet to come up. No one seems to be talking about the noisy headphone jack that hisses, squeals, and produces static noises. Grrrr....