Now that the IC patch had loaded in, siphoning attacks kind of sucks. I'll still use it and tank the best I can, but I'm definitely not happy with this update.

After trying it out, grim focus seems better. The fact that cripple is much more finite, and by that I mean only operates while on one enemy, that raises its cost and makes it too inefficient. For this build, focus is a better way to go. You have the buff for 20 seconds no matter what and then you shoot off your bow. Plus the stamina regen morph makes up for what nightblades lost in the update, or at least mostly.