
Originally Posted by
Pr0nogo
PROTOSS CAMPAIGN
Kerrigan learns extremely essential information about the Dark Templar and what remains of the Conclave, as well as their game plan for exterminating Zerg and rebuilding. This information is used later on, in the Zerg campaign. Smart!
Kerrigan infests Raszagal, the leader of the Dark Templar, and uses her to manipulate her people into doing her wishes. She does not lose any warriors in doing this, but gains an extremely valuable asset. Smart!
TERRAN CAMPAIGN
Kerrigan infests Duran behind the scenes and has him join the UED, making him the Swarm's contact within this powerful new Terran faction. Now she can monitor what the UED is doing and plan her attacks on Mengsk accordingly. Smart!
Kerrigan acquires intelligence as to the whereabouts and strength of the new Overmind, and finds out that it is now the UED's pet. Smart!
ZERG CAMPAIGN
Kerrigan uses Jim Raynor and Mengsk to fight against the UED, which are now a threat to all parties involved. This works extremely well and helps her knock the UED down to size, all the while preventing the Dominion, Fenix, and Raynor from realising her true colours. Smart!
Kerrigan betrays the Dominion and Fenix's Protoss, killing both General Duke and Praetor Fenix in one blow. While this blows her cover, it also allows her to deal massive blows to her enemies and knock them down to size, as well, making it really easy for her to mop them up. Smart!
Kerrigan uses the Dark Templar to destroy the newborn Overmind, all the while orchestrating things from behind the scenes via her asset - the infested Raszagal.
Kerrigan loses her asset to Zeratul's blades after the cover was already blown by Zeratul's intellect (not because either party was stupid!). This is bad news for her, but if her cover was blown, Raszagal no longer has any worth and now has no hope of becoming uninfested or returning to lead her people, dealing a massive blow to Protoss morale. Smart!