It seems the tricky part is motivation. Very few people get excited by card-reviewing itself. The method shines when there is external pressure, such as exams.

It seems the tricky part is motivation. Very few people get excited by card-reviewing itself. The method shines when there is external pressure, such as exams. I think a sense of community can help provide this motivation (like a group of people all learning at the same time), but it's still tricky.