Poor Implementation of Standard Questions
The app is buggy because, for example, the start page has no obvious place to click to open the card decks. And the few links on that page are often hidden by the background graphics.
The cards have formatting mistakes, for example, by sometimes not having the complete question on the card. The remainder of the question is found on the “answer side” of the card. Useless. Also, some cards have the answer printed on the bottom of the “question side” of the card. This card deck was not adequately proof-read.