Little things that bother me when using OS X
Don't get me wrong, there are a lot of things to like about OS X (there's a section with just a few of my favorite things at the bottom), but I've become acutely disillusioned with OS X's veneer of perfection. It seems to me that one of the main things that Apple accomplished with OS X was to create and maintain a thriving ecosystem of third-party applications specifically designed to fix the shortcomings of the operating system.
Mind, I'm also an OS X newbie. I'm sure that there are apps or console commands or buried settings that fix a lot of these gripes. But that also sort of proves my point - because many of these are things that ought to be incredibly simple, or easy to tweak, or have a better default; but they aren't, or don't. These have been the pain points for me as a relatively experienced Windows and Linux desktop user trying to get used to OS X.