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And, why would you want to do that? Well, as you can see, GNOME 3.2's interface looks quite different. Many users really dislike this interface.
Mint with MATE, a GNOME 2.x fork, looks a lot like Mint with MGSE, but under the hood it takes its own path.
In use, Mint MGSE uses a familiar primary window with menus and icons to allow you to use applications.