For me, it's the WiFi that is completely botched. The status bar will frequently display incorrect statuses and trying to select a network from the status bar hardly ever works. I have to go into system preferences which has a tendency to totally freeze up for minutes at a time when I select the network tab.

Then it'll occasionally get into a state where it tells me it's connected to the network but doesn't have Internet access and it must be a problem with the network (I know it's not because I have other devices connected to the same network that work fine). To get out of this, I have to turn WiFi off and back on again but Apple in there infinite wisdom has decided if I turn it off and back on too quickly, I must've done so by mistake and so they don't actually ever turn it off. So I have to turn it off, wait some unknown period of time (I usually wait 30s), and then turn it back on. Drives me crazy.

In the end, every morning when I get to work, I expect it to be roughly 5 minutes between when I arrive and when I'm actually online.

My personal computer running Linux has never had such a ridiculous issue (it does occasionally have issues but they're usually fixable after a quick Google search) but somehow everyone claims Apple just works and Linux is to much of a pain.