Let's start by looking in Google for the default Joomla! title "Welcome to the Frontpage" and Google claims there's 5,000,000 results with all those words in the title.
However, many Joomla! users seem to somehow manage to change their title but leave the meta keywords and description as follows:
<meta name="keywords" content="joomla, Joomla">Why does Joomla! even allow pages to be published without all these fields properly set is beyond me. It's simply amazing that the software could easily teach their users better practices and easily help them rank better yet allows the system defaults to be published.
<meta name="description" content="Joomla! - the dynamic portal engine and content management system">
Any hungry SEOs out there looking for some low hanging Joomla! fruit?
Possibly some easy money to be made if the price is right.