I came across an Article on the relevance of Compiz-Fusion in Linux particularly in Ubuntu. The Author, Matt Hartley, has published two different articles Here and Here to emphasize the same thing. His main argument is that Compiz makes Linux Complicated.
The Ubuntu GNOME looses its very foundations -- its simplicity. I think he might be right on certain points but overall I do not agree with him. Lets look at some of his points: