I have taken a lot of classes for different projects. I seem to always learn what I need to from the class. Lots of time, I think the classes are over filled and the instructor just can't get to everyone. Also as a former high school teacher, if someone doesn't ask questions, you think they are getting it.
For me, the classes are becoming cost-prohibitive or maybe I have reached a point where I don't really need them as much. I recently took a class to make an apron. It ended up costing me $50 for that apron!! It's also ugly as I didn't get to pick my fabric!! I have become a student of the University of You Tube. It has about all you need to know in one way or another. It's showed and taught me in some ways, more than a lot of paid-for classes have! LOL