Do you have much use for them?
I use them if I have an opening, or I grapple if I am trying to disable but want the critter to hang around rather than bleed out, or I kick if I am badly encumbered and facing an easy critter. Otherwise, since I got enough skill to aim a punch decently well, I use that.
I find an aimed kick is slightly better at getting a crit kill than an aimed punch, but not enough to make the extra RT worth it, and an aimed punch is both better and faster at disabling than a grapple.