There are many that would argue that Gnome 3 is just that. Opinionated to the point of driving users away. Beyond that, there are many projects that I feel mee

There are many that would argue that Gnome 3 is just that. Opinionated to the point of driving users away. Beyond that, there are many projects that I feel meet your criteria: Enlightenment, Deespin, Sugar, etc. And, of course, you can go ask the folks at i3 or wmii for an opinion, I bet they will be happy to give you several.