audio - Most of the time it works, but there have been plenty of times that after an install, I have to go in and make a handfull of changes to get it working.

“you are using it wrong” developers - Lookin at you, Gnome, Mozilla and Pottering. Yes, you are donating your time, and I appreciate that, but don’t be dismissive of people if they bring up valid issues. If you just don’t want to fix problems, that’s fine, but just be honest about that, instead of blaming the user.

sleep/hibernate - I’ve never depended on sleep or hibernate to work properly. I gave up on that years ago, and whenever I come back and try it again, I remember why I gave it up.

documentation - As a seasoned linux person, I love man-pages, but they are soooooo obtuse and hard to parse for newbies. I also hate it when the website has mountains of documentation, but they couldn’t be bothered to put that into the man-pages.

video/wifi drivers - Yes, I know that this is mostly a problem because of the manufacturers. That doesn’t mean it isn’t a problem.

unsympathetic users - Just because it works for you, doesn’t mean it works for other people. I can’t wait for year-of-the-linux-desktop, but it just isn’t there yet. As soon as you have to tell a non-tech to open a terminal, the vast majority of them are out. You and I know that ‘editing /etc/somedir/somefile and running /usr/sbin/somecommand’ is easy, but sooooo many of them don’t know what that means, nor will they care. I hear that windows is pretty bad nowadays, but people will often stick with the devil they know.