When using pre-made decks the only efficient way is to follow along, i.e. if you don't know the source book/course it's not very good. Partial exception, vocabulary lists.
Agreed - and you can even go wrong with vocabulary lists if they're too advanced (some German vocabulary got overwhelming for me, I just dropped everything).
Another partial exception can be technical references (learning keywords in a programming language or git commands).
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.