The built in context help is just about useless.
Example: ‘check in’ in article manager comes up with “Checks in the article”
Why? was it outside the window in the cold??? GREAT!

“Refined Admin User Experience” the http://www.joomla.org/3/en page claims. UTTER RUBBISH!

Tutorials are either old and thus irrelevant to v 3.2.1 or useless.
Example: Creating submenu: the below ‘tutorial’ shows how to do that. IT’S JUST THAT THEY DON’T SHOW THE MOST IMPORTANT PART: WHERE DID ‘MENU A’ CAME FROM? WHAT TYPE OF MENU IS THAT?
Source: http://www.youtube.com/watch?v=gMNGhjzwuXE

Not just the interface and the structure but the whole community is useless.
Typical opensource.
(There is one good set of tutes but very limited and only for the very beginner .)

As a result, Joomla has a whooping 3.2% of websites worldwide and all CMS has wordwide usage of 44%.
In other words, the non-CMS websites are 64%.
That much about popularity of open source.

And stop bragging about “but its free” Would you eat a fruit if it was rotten to the core?