I'd say I'm new to the LITIEngine [since I started using it this summer], and as of now the biggest problem I faced was the difficulty to find how to use the most basic functionalities of the engine. For instance, I searched for about 2 hours both in the API and Google just so as to modify the mouse cursor image to a custom one.
The usage of the annotations still remain a bit of mystery [I tried copy-pasting then adapting what was written in the tutorial and it seems to work fine for now, but using what I don't understand is quite a bad practice].
Overall, I believe that what users should know is how to access the basic classes of the engine [searching a bit when we know where to look will then do the trick], and how / why to use the annotations.
The lack of documentation makes this a bit difficult, but the possibility of looking in the source code in order to comprehend how things work don't make this issue a priority. [That, and it is impossible to write a whole documentation out of the blue in one day anyway x)]
Thanks for reading