Over the past few years Ubuntu has become somewhat divided from the rest of the Linux community and it could easily be renamed “Linux Marmite,” as you either love it or hate it.
A number of reasons are often cited for disliking Ubuntu. Top of the list seems to be Unity. I maintain that Unity is a really good desktop environment. I spent some time working with it and I find it incredibly intuitive but my view of Unity is in the minority. I think that people coming to Linux for the first time and choosing Ubuntu as their distribution of choice will probably not be as put off by the experience as users that were brought up on Gnome 2.