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This makes no sense.
This is not about a "working" system. It's about personal preferences.
A fresh Ubuntu install is a working system - Unity or not.
Personally I hate the global menu with a vengeance. But it does work and plenty of Mac users are fairly satisfied with it.
I have a script ready in my Ubuntu One with a handful of changes. On every new install I run that script and after a few seconds everything is set to my preferences (kill global menu, default nautilus to list, etc...). But the default did "work".
A fresh Ubuntu install is actually a more working system than a fresh Windows of Mac Box. You get a good set of free applications out of the box that on other platforms have to be installed afterwards.
Sure if you like things different than the default you have to invest some time into tweaking it a bit. But the same is true for people who dislike some defaults on Windows. There you also would have to change registry settings and/or install utilities to change look and behaviour (for example to get multiple workspaces). And if you don't like a default setting on Mac you have to work to change that too. I doubt that the global menu can be get rid off on a Mac.
Ubuntu/Linux is not perfect. And all the systems have their strengths and weaknesses.
But don't mistake a discussion about personal preferences (which vary a lot) with a "working system".