I would agree with that assessment. When I went, I attended in a huge room with hundreds of other people. It was not a seminar in the sense of being able to interact with the teacher, but a lecture. And the lecture did not present a sequenced set of actionable principles, but bits and pieces consisting of the history of design, critiques of existing designs, an occasional bit of advice, and a lot about Tufte. Overall, I did not feel that I'd received enough value to offset the entry fee and the time.

Edit: clarity