What annoys me most is that engineering software companies are not interested enough in making compatible software with Linux. My brother as electrical, some of my friends as mechanical and me as civil engineer are stuck with Windows for any kind of work, and people call Windows alive only because of gameing. Why is that the case I have no idea, maybe user base is not large enough for them to make money. And I'm willing to pay for some work software that is compatible with Linux.
@Wetrix
Its true, too many distros. I would be happy if they made them compatible with any Linux distro, I guess popular Debian based like Ubuntu or Linux Mint should be a good start.