WordPress is definitely the world's most popular CMS. The script is in its roots more of a blog than a typical CMS. For a while now it's been modernized and it got thousands of plugins, what made it more CMS-like.
The script as an Open Source is the first choice for most bloggers, but it can also be successfully used for designing simple websites.
You can download and view the CMS at www.WordPress.org.
Easy, easy, easy ...
WordPress does not require PHP nor HTML knowledge unlinke Drupal, Joomla or Typo3. A preinstalled plugin and template function allows them to be installed very easily. All you need to do is to choose a plugin or a template and click on it to install.
It's good choice for beginners.
To have a useful support, there must be a large community of users, who will be a part of e.g. a discussion board.
The script has over dozen thousand of plugins available on its website. They are the reason WordPress is considered a CMS, not only a blogging script. Strong majority of the plugins is available for free.
On the scritp's homepage you can view thousands of graphics templates, that can change your website's look. You can find there both free and paid templates. The paid ones are often more advanced as well as more interesting.
WordPress menu management has extended functionalities, that can be modified to include categories, pages, etc.
You can easily add fields to forms by yourself or using plugins. It will allow your blog or subpages to have additional labels, categories or descriptions.
Modification requires knowledge of PHP
Operations like removing a date field requires some understanding of PHP language. It is the case for most of such modifications.
Graphics modification requires knowledge of CSS and HTML
Although there are plenty templates available on the homepage, most of them are very alike. To create a unique look, you need to know CSS and HTML.
Plugins and efficiency
To compete with Joomla! or Drupal, WordPress needs plenty of plugins to be installed. Unfortunately these plugins influence the script's efficiency and not in a good way. Another problem arises when you need to choose a plugin for a specific functionality. Among all the thousands of plugins, most of them have their clones. It means, that any given functionality can be added by several different plugins created by different authors. Sometimes choosing the right one may take quite some time.
The script is not protected as well as other applications. It all depends on how sesitive is the additional content of your page.
Tables and graphics formatting
Queries can be complex since all additional non-standard fields that make WordPress a CMS, require additional syntax.
WordPress is a very good script to create a simple website. It is one of the simpliest to use (definitely not simpler than Quick.Cms though) of all solutions available on the internet. It's very good choose for a beginner's. Advanced users with advanced needs would have to install many plugins to have what is a standard for Joomla or Drupal.