"There are many Ubuntu users who like Unity interface and its
ability to optimize screen space. But the default main menu is a
bit of pain as all the categories are hidden by default and it does
not support wine menus. There is an application lens but it is way
down at the bottom, not movable and most of the time it is folded
as I pin lots of applications on Unity launcher.
"But, you can now permanently have another classic Gnome style
menu in Unity itself, thanks to Cardapio. Cardapio has an excellent
plug-in system which not only provide similar functionality to the
default Unity menu but is actually more powerful than it. You can
create your own plug-in as there is a dedicated API for it. Also
Cardapio menu is themeable. Though there are not many themes
available as of now, you can find some of them on the web."