Clarity and Points
Sometimes it is very hard to understand the voice's pronunciation. If one is familiar with the a lot of vocabulary, then there is a good chance of understanding the sentence. Otherwise, one gets docked for writing what was heard. Frankly, I'm sure this is understood and good attempts have been made to aide in this area. It's just frustating when a certain sound is unclear and the student isn't quite sure because of vocabulary strength.
Plus, regarless of whether one passes a certain lesson (making it through without losing all their hearts), it seems a certain number of points should be counted. It's not like complete failure of learning occured.