It depends on what you're trying to learn. There are certainly some things which don't benefit much from the flash card format, but I do think even then, these kinds of complaints are largely a failing of the user, not the app. If you get a little creative and experiment with the format of your cards, you can learn pretty much anything via Anki. Or at least enhance your knowledge of the skill you're ostensibly also practicing in real life.

The mistake most people make is simply adopting the "boring" flash card format of FRONT-BACK, and not incorporating other more creative types of cards. For example, question-answer, visualization, triggers, or unique images. ChatGPT is pretty useful for this, as you can get it to present the same information in a variety of different formats and contexts.