I can remember being in a large lecture hall with 300 other students learning Calculus and other GenEd classes 3 days a week. There was little to no interaction with the professor only the supporting teaching assistants that we met with on Tuesday and Thursday. There was really not much educational value in meeting in a large lecture hall versus watching it online. It also means I can watch it, rewind it, watch it again if I don't understand it the first time. I would not want to use that as a substitute for advanced learning classes where the interaction with the prof is key.
Of course there are certainly other advantages to being in a classroom that cannot be duplicated online. Q&A, expansion of a topic, etc.
