I will not disagree, but will point-out, others may not have shared the same experiences you have. I have purchased Rev A for:
PowerMac 2.0 Dual
PowerMac 2.5 Quad
MacPro 2.66 Quad
Tiger
Panther
Macbook Pro 17"
Macbook Black
MacMini G4 1.42
MacMini Single Core (15 each)
MacMini Core Dual (8 each)
Macbook White (sister)
iMac 20" G5 (brother)
iMac 24" Intel (father)
iWork 5
iWork 6
FCP 4
FCS
I experienced 1 HW issue - that was with DVI on the G4 MacMini. It was quickly resolved. I had an issue with the 10.4.7 upgrade on my Powerbook G4 17". It would not boot. The update program did not appear to complete. I booted from the recovery disk, ran the upgrade again, and did not have another issue.
If Apple was not as dependable as they have been, I would not be here singing their praises. I was the driving force for installing a Sun enterprise system in a mid-size, aerospace manufacturing company. I also administered it for nearly 6 years. I have also been professionally involved in all aspects of PCs, for nearly as long as they have existed. I never would have thought a company could harness the power of Unix, in a desktop OS my father could use.
Unix was never intended to be 'for the masses'. AT & T/Bell designed it as an OS which gave virtually total control to programmers. So, the kernel was very lean. Conversely, Windows has continued to 'bloat' with each new release.
It is easy to jump on the Apple bandwagon. They are not perfect, but only a non-IT person would expect anything better. They bring solid engineering and excellent QC. They are innovators. So, I have no issues with buying their Rev A products.