I have to honestly say I feel like the TMS did help me in a few aspects as it exposes you to an audience and the public speaking environment. It definitely helped me to get over (or at least cope) with my terror of speaking in front of others and helped me to at least read moderately-well in three languages.
What I never understood was how I'd pass a lesson and then be reassigned the same one within a few months. But you do have very valid points that cannot be refuted, some of us learned something while most of us dreaded our assignment and couldn't wait for it to be over.