[note: I'd say the same thing if it were python, perl or lisp based]
I did not try "Awesome". Actually, I rushed to read this article because of it's title:
"Awesome: A window manager that gets out of the way"
As for "Awesome": I assumed LWN was actually impressed by the window manager. It happens to be it's name.... ok.
Second: "A window manager that gets out of the way". I was expecting it not to interfere with what I'm doing, but "visually minimalistic" is not what I was expecting. Rather "open popups where they belong", "place windows at right place", "don't steal my focus".
Third: I don't expect the window manager to be "highly configurable", because there are not many interesting things a WM can do (and as such, not much to configure anyway).
Then we have "lua". Could have been "python", or any other high level language. But that's not what I want from a WM (I use XFCE btw). I want a simple, fast, with low overhead window manager.