Recently I have started studying at TAFE college, and have had to use Moodle as a student.
What is the biggest problem?
A/ Not the technology - but the fact that some of the teachers are very slow or forgetful about uploading student assignments etc, and when they do upload the assignment files they put it under "course content" or some other illogical place. This wastes SO much time just trying to locate work which is due in a short time frame. All this does is just frustrate the motivated students, and give the slackers an excuse not to do the assignments.
In these cases it would be far more effective just to hand out the printed question sheet to the students in class.