
I have a mixed views of gnome, one criticism I have with it the old one of it has been simplified to the point of being un-intuitive. When people accused gnome of this in the past I dismissed it! Now I have noted that to minimize the open application I have to point to the upper left corner, no buttons for this. File, Edit etc are not part of Gnome apps they are in the bar at the very top of the screen. Much of this change is change for changes sake, its unfamiliar (no other desktop works this way). Its a shame because the general concept is good. One area (top left corner) gives you access to all applications and parts of the system.
If you want a minimize button on windows, install GnomeTweakTool. It has an option that allows you to select the arrangement of buttons on a window's title bar.
All Finagle Laws may be bypassed by learning the simple art of doing without thinking.