Let’s look at general point values, from best to worst. Note that these are point values, not the number of protection points in the anchor. A FOUR-POINT PIECE is bomber—able to hold a substantial fall. A THREE-POINT PIECE is pretty good—able to hold a 10- to 15-foot fall.
A TWO-POINT PIECE is weak. Placed at your waist, it will hold a fall or body weight, but probably not much beyond that. A ONE-POINT PIECE is essentially an aid placement. It will hold body weight, but it’s unlikely to hold a fall.