Content management systems are almost always written well, and widely used. There are plenty of web masters that would swear to CMS abilities. Errors and coding bugs are rarely a problem, but only if you find a trusted and capable vendor.
These systems can also be easily installed. It is not difficult to install these systems and get them running immediately. It is a simple solution for most that comes with a host of advantages.
Content Management Systems are also easily available and offer a low cost solution to running and operating a website. This is in additional to the plenty of free CMS available on the market today.