Drupal is very powerful and can be used for almost any type of site, but my understanding is that the configuration can be daunting because of the flexibility. The company I work for is building sites for the EPA using Drupal. This is what one of the Drupal pages looks like... http://www2.epa.gov/science-and-technology/pesticides-science
Joomla has been around forever and has a large user base. I used it a lot in the past, but I haven't built a site in a few years and they've released a lot of major version updates since then so I can't tell you if it's still good.
Wordpress is a hacker magnet because it's one of the most widely used content management systems. Don't even think of using it unless you intend to really, really, really stay on top of any patches and security updates. If you're not up to that, you can get a managed hosting solution where they take care of the updates for you. Either way, you'll still probably get hacked. That's just life with Wordpress.
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