I have to say, I agree with you totally. I havent enjoyed Jam this much iin quite a while.
I just finished my 3 day module training today and even though our bodies and legs are in so much pain, I have to admit that it has been an amazing experience. Jam 45's songs were amazing and the moves are just..indescribable. Just having the songs on makes you want to groove to the music. I'm not much of a rocker and havent clubbed in ages but I found myself being immersed in the feel of the music.
The moves are challenging, and yet oh so beautiful when executed in the manner they were meant to be performed in. I can't even begin to describe the satisfaction of finally getting the execution of a move like the Butterfly spin. Or adapting to the unique 'offbeat' tap in the second cardio block.