No discussions about each lesson in general?
There used to be discussions on each lesson, right below its "chapters". This was specially useful when the lesson had no 'minimal' introduction regarding grammar; or when there was something tricky about the words in the lesson, or when some guy from around the world discovered an easy, clear or a really mnemotechnical strategy to approach the contents in the lesson. Thus it was easy to contact with the users' feedback regarding the whole lesson and not only a particular excercise. If there's anything "valuable" (say, a general view) in the comments on particular excercises, most likely senario is that you do not find it or, if you do, that'll be sheer luck. I think that is something this new version defenitely lacks.