Today's patch promises an improved Natascha, seeing that the poor girl hasn't gotten much trigger time since she was introduced.  Valve promises that the damage reduction has been set at the "true" 66%.  (A persistant bug had set the damage reduction to 75% previously).  Additionally, they are increasing the amount of Slowdown that happens when players are hit.   Playtesters are finding the new gun much more reasonable, especially for slowing down all the scouts who are running around with new toys.   Toys that will probably be available to the public within 2 weeks.

See Here nao for more info.