Im sorry you had such a bad experience. I love taking classes. I just took one from one of the quilters on this Board, Susan. She did a great job on the OWB.
Right now I am taking the Stitcher's Garden, which is a quilt that teaches you how to use all the feet and accessories that come with your machine. In some ways, you could look at this as one long advertisement, because they are demo'ing it on their TOL machine EXCEPT they are nice about showing you the procedure even on your machine which is the important part. I have learned alot about twin needles, cording, piping, QAYG.
Maybe you should take a class with a friend. That is what I do sometimes.