We have fixed a bug in 1.04 that was making it harder to blackjack alert guards. Please do not vote based on prior experience, but try blackjacking guards after updating.
If you are still finding blackjacking too hard, please be specific about the circumstances. Are you failing to KO guards with helmets? Alert guards? Are you failing primarily when trying to KO moving guards or is it standing guards as well? Have you tried the blackjack trainer?
We would like to get a sense of who is finding blackjacking difficult and why. Obviously if you are watching T2 speedrun videos, and expect to be able to run down a hallway and blackjack a guard on the elbow, you'll be disappointed with TDM blackjacking. But if people have reasonable expectations and are still finding it frustrating, it's something we should probably look at.
We have a poll setup on The Dark Mod forums. Go there to place your vote.
http://modetwo.net/darkmod/index.php?/topic/12388-how-hard-is-blackjacking-in-104/page__pid__249664__st__0&#entry249664 (http://modetwo.net/darkmod/index.php?/topic/12388-how-hard-is-blackjacking-in-104/page__pid__249664__st__0&#entry249664)
I voted 50-50.