You can have different Desktops Environment(DE) or Window Managers(WM) as you wish not just Unity, by the way a lot people doesnt like it.
Check this out:
http://xwinman.org/ Consider try different graphical user interfaces(GUI) before completely removing your Ubuntu,
most known ones are Gnome, KDE, Xfce, Lxde, Fluxbox, Blackbox, Openbox, there are many choices that you can have as replacement for Unity.
Regards