Wow, that is a string of bad luck. I've only had problems with two since buying the first iMac. Basically:
1) Original iMac - after several years passed on to my sister who then passed it on to her kid after getting my mini Mac (below). Finally bit the dust when the kid plugged the wrong fittings into the usb hubs.
2) Mac G4. Kept going although it was loud. Passed on to my brother after four years (I upgraded the processor card). I think the total life on that one was eight years before it wouldn't boot.
3) Mini Mac G4. Passed on to my sister who still has it.
4) White Macbook ~ maybe 3 years before the inverter board died replaced with...
5) Current Macbook seven years and going though the screen is dimming
6) An iMac ~ 4 years ago had problems with the DVD drive. Covered under warranty. Still going no problems.
I think that longevity is true for most electronics these days though I can't say that about a certain brand of PCs. I was a LAN administrator where I worked and one of the PC brands had a high failure rate after about two years. Since we bought in bulk it may have been limited to one model but our next batch wasn't from that manufacturer and we haven't had the problems with others.
Laptops will always be less reliable than desktops and tablets. With a laptop you have more heat issues and the wiring in the hinge is always problematic. How many times can you open and close a laptop before the wiring breaks or if it is a sliding connection, wears out? Plus they get tossed, jarred, squeezed, etc. Solid state drives are a plus but they have their own issues.
5) Current Mac
I see that most of your examples are older. My point was that Mac reliability may not be what it once was
today.
The issues I've encountered have been with 2010 models and newer. My first Mac, a PB G4 17in, lasted me for 8 years, until I sold it (in working order).
I don't abuse my laptops; their use has been identical to the PB I mention, but the issues have become more common. I would fix them, then sell, at a rate that I actually bought a new Mac every year (thank you, resale value).
The iMac was the biggest disappointment, and despite loving the concept of it (beautiful machine), I'll never buy one again. I am 2 for 2 with those (I sold the first right after getting it fixed under warranty);I really wanted to keep the last. But that sucker gets WAY HOT.
Graphics cards and CPUs are far more powerful today and generate a LOT of heat; combine it with HDD and screen heat and you got a furnance in there. I even found an incident online where the screen simply fell off one of the new ones (while the owner was using it). This is easy to believe, given the heat the machine can produce combined with the fact that the screen is
glued on.
So, right now, I'm stuck with purchasing an under-powered Mac mini or an over-powered (and likely EXPENSIVE) Mac pro...
Fedora is looking better by the minute... (I saw a mod that made it very OSX-like)
But I really don't want to leave...
I still think that Mac laptops are the best in the business though, as is OSX. Apple is just not giving me the
hardware I want (took away the 17 in MBP too). Bummer.
So bottom line, temper expectations (and get Apple Care).