From a novice tankng perspective I dont mind the knock back if, the group isnt aoe killing, and it is not the mob currently with the lowest health. This generally avoids the missed dmg and after 3-4 hate grabs i find it is rare to lose hate within the 15 seconds or so it wil be away from the pack.

Do not use it as a finisher, the target ring stays on the mob till it stops moving, and will screw the expected tab target order. (Yes there are ways around this targeting issue, but generally you dont know what targeting method is being used so just don't risk it)