Harrold Andraste said:
The galaxy was never in danger from her by the time KotOR 2 happens.
The three villains are retroactively meaningful, but their relevance is already over by the time the Exile even meets them.
None of this is true...at least concerning Kreia it isn't. She mentors The Exile and helps him/her reestablish his/her connection with The Force. Without that none of the events in the game would have happened. Not only that she manipulated quite a few people into helping the exile. Without that The Exile would have certainly failed. Whether you destroy the remaining Jedi or save them they still die which only helps her cause. Lastly, knowing she didn't kill The Exile in the rebuilt Jedi enclave she knew he/she would come after her which would put him in the path of Atris, Nihilus and Sion. Kreia is like The Joker in The Dark Knight. She made moves and got the plot moving and was ultimately the center of everything.