We are in the process of moving from 1.9.x to 2.3.x. What a pain THAT is, but that's not the topic I intend to cover here.
Instead, I am baffled by the new import function. Our teachers use the import feature HEAVILY to reuse material. However, when importing you no longer get the "deselect all" option, instead if you're importing from a course with hundreds of activities and you only want to import a couple, you need to deselect manually again and again. A needless pain which could be easily rectified by a simple "deselect all" option.
Furthermore, the fact that legacy files aren't imported is just baffling to me. We have teachers who have hundreds, or in the case of quiz banks, even thousands of images attached to questions or activities, that will not be imported.
These are the sort of issues that absolutely needs to get solved if more are to be pursuaded to move from 1.9 to 2.x. Infact, if I had known this in advance we probably wouldn't have bothered.
Rant over. If I've overlooked some simple solution, I would be very happy to know so.