It's best for things that MUST be memorized, such as the names of psychologists and their major theories, fundamental organic chemistry mechanisms (some of my cards are "commands" to draw out a reaction and the back side shows what it looks like), and the specific anatomic structures and the clinical name used by current surgeons (ie. "Morrison's pouch" for the right hepatorenal recess).
@aldol16 is correct in terms of warning against useless memorization.
Anki is optimally used as a way to use a tiny fraction of necessary info to trigger the complete recreation of a thought over increasing intervals of time. This means if you were trying to remember a picture or diagram, you would work to have cards that give you only 1/10 of the picture fragments, but allow you to find the other 9 because of how you constructed them. This is why downloading most Anki decks does not help the average student. In a 50 slide PPT of dense information, there is no reason to ever have more than 80 cards that have a single factoid on them. Lists, such as mnemonics for multiple items, should be kept at a minimum.
That's really it. It takes about a year to get "decent" at making cards (Learning how to use the program to its fullest, tagging, having a uniform format, working on speed, accurate data extraction from text, PPT, lecture, and internet sources).