I tried out Hunting the Dark Dragon. In all it was a great story, but I had issues with the combat. First, I just don't like malta in general, but I won't fault you for that.
The space pirates on the other hand were too rough. In my opinion, until it is fixed, no custom mob should use ninjitsu (unless its made for a personal challenge). Nothing is worse than being ambushed by npcs with a massive damage bonus. There's no way my squishy controller could have finished if I didn't have phantom army to absorb the blows and superior invisibility and confuse to avoid fighting. As it was, the ambush in the fourth mission killed me because of ninjitsu mobs two shotting me before my army could get aggro. I also think the pirates would be better if they had some minions instead of spawning as groups of three lieutenants while solo.
Therefore I give the arc 4 stars, but not because of the story, that was great.