Why do I think it's worthless? Because those in my 121 new hire ground school with aviation degrees thought it was hard. Those of us with engineering degrees thought it was relatively easy. I didn't use a single gouge, did all the homework, got plenty of sleep, passed all the tests in the high 90s, and thought it was one of the easier things I'd done. Compared to my engineering courses...well, there is no comparison.
LOL I met guys who never been to college think new-hire ground school was a piece of cake. I also had students with engineering degrees that couldn't memorize procedures if they had their life on it, All they had was a big head.
Just because you had an easy time with it dont mean a thing in my world. Engineering degrees are as useless as the moon if you go to college just to get the check-mark.