Just finished this fight yesterday. Apart from having enough Voodoo Dolls (0 action points? WTF ...) for 3 dragons the fight made clear that the main target was Astarte. 2 of 3 of the dragons summons started near her and the first dragon attack went solely her direction.
Even without the dolls the fight would have been fairly easy. First round - get party near and divine light/lower resistances/drain willpower. Second round - stun, freeze, trip, knock whatever is available. 3rd round - start doing serious damage. I only remembered my stockpiled dolls in this round.
Yep, definitely a disappointment compared to some fights before, especially the Cyseal boss fight against Braccus, which was comparatively much more difficult.
Regards,
Thorsten