I've got troubles blackjacking personally with the way I play. Basically I've got autorun and toggle crouch enabled, so when I want to get near an enemy I have to hold shift to walk, then I have to press ctrl with the same finger to stand up while still holding shift (which is just impossible), and then I have to aim for the head. Thief did something great with the auto-stand up feature when brandishing your blackjack, and it did it for a reason. Because having to hold two different keys and pressing a third one to accomplish a simple action is a terrible idea. I can understand why some really hardcore players would want to remove it, but I think it should be left as an option in the settings. Because coupled with the fact that you can't approach an enemy from behind without being crouched and walking and the fact that if you bump in the enemy he will notice your presence, it makes blackjacking very random and almost impossible most of the time. Maybe that was the point but the result is that we end up not using it at all as it becomes harder than ghosting. In thief the challenge was to ghost the levels, here the challenge is to knock-out the guards.