The attached blog post says it all for me.  See http://internet-marketing-europe.blogspot.com/2010/12/content-management-systems-cms-small.html

I have re-written too many sites now that were inappropriately written first-time 'round using a Content Management System (CMS).  The clients that came to me were'nt being found and were spending a fortune (and long turn-around times) on even minor changes.

This is not necessarily the fault of the CMS toolset. It is usually poor design - although there are poor CMS's out there just like there are poor developer tools. 

The trouble is that a CMS then churns out page after page of bad, unsearchable code full of technical bloat.  This neither performs in the way it is expected to on the web and it makes any changes time-consuming and expensive to effect.

As the attached post says:  you wouldn't take your car for a service and tolerate a mechanic approaching it with a hammer. Why do exactly this with your website?