Yeah. Anki (and flashcards in general) are great for helping you remember something _you_ learned (from a book, video, class, etc.). Not for transferring knowledge someone else learned.
Writing my own cards as I'm learning is the only way I've found it effective.
First learn the material. Then use SRS to schedule the practice of effortfully recalling the material just before you would have forgotten it.
I think too many people use SRS to learn the material instead.
As I recall, the creator of Supermemo had a list of 20 suggestions or so, in which he urged people to first comprehend the information; then to learn it; then to memorize it; and then to rehearse it (SRS) so as not to forget it.
Writing my own cards as I'm learning is the only way I've found it effective.