The Development version of Wordpress
When I started looking at Wordpress I downloaded the PHP code to my webserver and configured a blog using the software.

The reason for this was that I was being told that Wordpress was the most "useful" platform to use for building websites. I was not impressed. Not only did the php code take most of my server space, as I only had a limited amount at the time, it also limited my ability to develop my own html code.
The reason that I found the Wordpress install less than ideal was mainly due to the way that it was implemented by my hosting service. When I accessed my domain I was directed to the Wordpress site automatically. I probably could have fixed this and worked in two environments but I considered that Wordpress was taking up too much of my server space.
Level of Complexity
When I took over the webmastership of the Village Hall website I had seen a previous attempt at the implementation of an Events Calendar on the Wordpress.com site. At the time I saw a lot of PHP errors being thrown and was curious to see how they were going to be fixed.
Another exposure to Wordpress.org
In my dealings with a certain person that I managed to upset in Canada it was observed that he had registed multiple domain names (in an automotive theme) and populated them with Wordpress websites. The theme that he had used for these sites was "Twenty Eleven" (I think) and they looked pretty much the same as each other. He didn't even take the trouble to change the graphics from the template.
The other aspect of this activity was that the registration of the domains was probably done using a service such as Go Daddy, free or 99¢ for a year. The cost to the person who was using them to post bogus comments about me was minimal.