I would say any class that's big enough to where you just blend into the crowd, meaning just a lecture class, is pretty much useless to attend and the same cont

I would say any class that's big enough to where you just blend into the crowd, meaning just a lecture class, is pretty much useless to attend and the same content can be found for free online and with the textbook. The academic value of college comes from small class discussion (you don't get this in large lectures), direct 1:1 access to professors/TAs, and the ability to work together with other students. If you don't get these, then there's no benefit of attending a lecture in person.