I think Assassin's would be great if a maxed class upgrade added a 1 second stun or gun disarm or an ability lock after the target is grabbed. And making a grab from the bag a one shot kill of course. But only talented. Because Gold Armor would be pointless to an extent. What ya'll think?
Haven't had much trouble with post grapple kills. In fact, I rarely even encounter post grapple attacks because I start my move with a lunge attack.