[Mezzie]

It's wildly dependent on the topic.

I never went to my physics classes in college - there was no attendance requirement outside of lab and I saw no reason to since math and science were easy for me to grok on my own.

On the other hand, I also studied languages and classroom and face to face time is almost essential for in-depth language study. Language study isn't usually lecture based, though. Not going to my Chinese or Arabic classes would have been a bad time.