Had a great quality of life. Went to see my girlfriend regularly, hung out with non-med school people fairly regularly, extracurriculars etc. The times I did have to watch lectures online I'd always feel I was missing things if I sped it up. I'd have to go back and listen to certain segments multiple times when watching on anywhere between 1.5-2.0x. I avoided doing this as much as possible because it just wasn't efficient for me and 2.0x never meant I was learning at twice the speed. Sometimes it was unavoidable, though, when a tutee could only meet during class time or I had some sort of meeting that conflicted.
I cannot imagine that not going to class would have gotten me better grades in the few classes I did not honor. Of course somebody else may be different, but I believe it would not have worked better for me. I also think that, while there are those out there who work better when watching lectures at home, most people think they are this type of person and these people are actually rarer than most people think. For what it's worth, a disproportionate number of the high-achieving students in my class were people I regularly saw in lecture. Of course others may be different, but from my own observation I would guess the odds are against any given person on this. I think people should try lecture for a block or so and then decide if it's really not working. Most people bail on it earlier, though, and never know what they're missing.
Whatever, though. I'm not really judging people who don't go to lecture but I'm just putting up a defense of lecture attendance in response to the person who was like "Who even goes to lecture? lolz"