hm, if you are going to use your future site only for blogging, then no problem, use WP. But if you are going to build a large website with a lot of dynamical pages, a lot of menus, pages then I recommend to use Joomla or another more powerful CMS.

Wordpress is for blogging only. It depends on your future plans.

For example, I'm using my own CMS on http://www.777-online-gambling.net but I also integrated WordPress there for blogging http://www.777-online-gambling.net/wordpress/ .

Yes, I agree, Joomla is bit difficult for the first time, but when you read the Joomla manual, you will know everything. Reading the manual takes 1-2 hours.