I use Geni extensively and, despite the many mistakes, find it an incredible source of information.
What makes use difficult is the fact that there doesn't seem to be an agreed way how to enter details and because of that anyone just does it the way they feel correct.
In particular what disturbs me is the fact that many people enter someone's wife with the surname of her husband rather than her maiden name. In order to find the maiden name one would have to hoover over her name and find her father's name. Quite annoying. Can the curators do something about that?