The doc's fairly incomplete and requires you to actually browse through all the separate libraries that comprise the standard distro to even understand what you can use and where. It being OOP-tastic and brimming with interfaces and namespacing is great, but it is far from friendly to Symfony newbies.

Feels like you have to know Symfony 1 to understand what 2 is trying to do really. I wouldn't recommend it as a good intro to MVC.