I thought it was pretty clever to adapt the form of an "attractive" (cough) human female in an attempt to seduce "Ladiesman217." Intimate situations require people to completely lower their guard and are at their most vulnerable, so tactically it makes sense and shows that the Decepticons do have a good understanding of human psychology.

But yeah, there's a lot more potential for these humanformers; they could infiltrate various aspects of society including positions of power! Imagine if Obama turned out to be a Decepticon - Change You Can't Believe!