Though I have not used Anki, I used a similar SRS for learning Chinese - the flashcards built in Pleco, but no matter how often I try to use it, I never last longer than 5-10 days, I just get bored by it. Also, no matter how I try to adjust the algo, I have the feeling that I am constantly over- or underwhelmed, no flow for me.
In the meanwhile I love learning, no matter if flashy (e.g. Duolingo) or traditional (from books) or something in between (a class), but I just never got the hang of SRS, though so many people recommend it.