Healing Signet is actually pretty good. The real problem is that Tactics offers very little besides it. Shield Stance is a decent block to hide behind.
You really don't want to spec into the Healing (/Mo) or Shadow (/A) lines for survivability (maybe for Dark Escape or Feigned Neutrality if you're a chicken). A viable option is Signet of Malice, since many attack combos revolve around inflicting conditions.
Of course you could just rely on hench Monks like I've come to do...
EDIT:
I've played a fun Assassin-style Sword Warrior for a while. If I would have had Proph, this would be the build:
W/A (PvE), Proph-Factions only
Tactics: 12+1
Swordsmanship: 12+1+1
[skill]aura of displacement[/skill][skill]frenzy[/skill][skill]sever artery[/skill][skill]gash[/skill][skill]signet of malice[/skill][skill]final thrust[/skill][skill]shield stance[/skill][skill]healing signet[/skill]
Just fight to build some adrenaline first, then switch target to some unwary backliner and smash the crap out of him, curing yourself of any conditions in the process. Cancel AoD, rinse, and repeat.

