I don't know if anyone has seen the article here:
http://www.tomshardware.com/reviews/ubu ... ,3121.html
"Ubuntu 11.10 Review: Benchmarked Against Windows 7".
As well as comparing against Windows 7 it also gives an interesting history of how Unity has changed, and views on why. I think I found more information on Unity, its evolution etc, than in any article than in the magazine, or is that just me...