They do have some official tutorials, but it's up to you to read the documentation and code to figure things out. It's not as bad as it sounds because everything is fairly straightforward. Bring patience, though.
"Bring patience, though.", and that's the exact thing; when starting out with a new framework/technology/etc. I really need test examples that are digestible to get me going - the machine learning part of the tutorials: http://docs.opencv.org/doc/tutorials/ml/table_of_content_ml/... is no doubt brilliant but it is utterly inaccessible to me without serious time input.
I'm there with you. This thing is so complicated that it might be hard to just do an easy to follow tutorial. I've been tinkering with it for a while in a robotics application, and progress is slow (steady, though). One of those fields where the roads are still unpaved. :)