Graphology makes more sense than the House-Person-Tree test, or at least as much sense. The problem is that it is erroneously associated with palm ream and star gazing. However, it is not mystical. It is simply an analysis of a reflection of your character. Everything you do is colored by your personality. Why would handwriting be any less?
In stead of bunching any self professed expert together in order to pass an unfavorable judgement, choose one celebrated expert and follow his results — as we see from the Sugya in Shabbos.