Your experience is not so unusual. I had some similar disappointments as a freshman. It is also mostly true that as a business major I learned almost nothing of technical value in four years. The true career learning starts when you go to work.

The value of the undergraduate degree is little more than proving that you have the ability to complete a lengthy task on your own. By it's self that is no small accomplishment.

The value of "University" is an intangible that can be profoundly rewarding. It is one of those things where the total experience can be greater than the sum of the parts.