I share your frustration. I've had terrible issues with all sorts of Macs over the years.
White MacBook: (2006, C2D, 2GHz): cracked plastic pieces (hence the name 'CrackBook). One USB port failed (that's when I sold it).
First generation MacBook Air (I've had two): broken hinges, CPU whine, overheating.
Unibody MacBook (I had to return three or four): misaligned keys, constant fan, one of them had high-pitched noise right from the beginning.
15" unibody MacBook Pro 2.53GHz: piss poor battery life, faulty graphics. (Otherwise a nice machine, it's a shame that it cost a fortune).
13" MacBook Pro: one day, first new machine to produce constant beach ball. CPU whine and the fan is regularly above 6000rpm. '7 hours' battery lasts less than three.
I recently took in two old eMacs from my garage. One of them keeps having the beach ball as soon as I start any web browsing. Both are fairly noisy, but actually, I'm OK with it as they aren't worth anything. But to have the above problems after you spent a lot of money for those Macs - it's disappointing.
I hear similar stories from people, but contrast us with some posters who keep bashing non-Apple computers as crap. Sometimes, I wish that my expensive Apple hardware was paid by them or from their kidney.