It's not impossible to defend against but for now, we'll play with the aspect that hopefully, your teammates can distract their monk just enough so that you can do your thing. As in, KILL outright in one combo. If you play this build correctly, not only will you never be low on energy, but I don't think any squishy target will survive after you use it.
11+1 Dagger Mastery
9+1+3 Critical Strikes
rest to Deadly Arts
Unsuspecting Strike
Black Lotus Strike
Twisting Fangs
Moebius Strike {E}
Critical Strike
Critical Eye
Siphon Speed
Plague Touch / Res Signet
Wow, now THAT'S a lot of damage. If the enemy is blocking/evading your damage due to wards, enchants, spells, etc, you'll have to do what warriors do. Switch targets, unless you have a teammate with Expose Defenses, Rend Enchantments, etc.
Some people don't know what I've discovered about siphon speed. With this build, if you wish to escape, charge in, you need your siphon speed target to live, so siphon speeding an enemy warrior/flag runner is actually the best use of this hex.
@ 20% speed increase, nobody can kite you in most circumstances consistently. And if they do, you need only land 3 hits for them to be nearly dead...
How do you feed black lotus then? Siphon Speed two people, why not? Under Critical Eye, you should have an obscenely high chance for critical hits and keeping your energy hot with Zealous Daggers won't hurt either.
After you do Twisting Fangs, Moebius Strike {E}, you want to do Critical Strike so that you'll get a double jolt of energy as well as use said energy to continue your combo.
You can split your points between deadly and shadow arts to replace plague touch/res sig with Way of the Fox. Hot shtuff...

Any ideas on fixing this build? [aside from relying on teammates] that usually fixes most build issues.