Here is an article explaining why Wordpress is for blogs and not full websites. I get questions about this all the time. I agree with this author. It is a very simple and easy way for a non-technical user to have a website that they can manage on their own. However, I can't see how it works well as a full-fledged platform.
The Top 10 bad things are exactly why you do not want to be using this platform for your very important business website - especially #1, #2 and #7. There's just too much at stake to have a security breach or a slow, wonky website. We continue to recommend a Drupal website for most cases.