My 2009 Macbook became slow as heck after installing Mountain Lion on it 4 years after I got it, taking half an hour to even boot up. Ironically, Windows on it was a lot more usable. I agree that yea, there are cheap Windows laptops that are pretty bad but all the laptops I’ve had after that which I paid similar or slightly less for, have been far more reliable and longer lasting than my Macbook ever had.
And as for complaints, doesn’t that really depend on what you’re used to? Every time I have to use a Mac, I find a quirk that I can complain about every other minute but that’s just because I’m used to the Windows workflow or Linux where I can modify it to work the way I want it to.