I think that we are forgetting how other characters in the game seemed to be repeating what Kreia was saying about Revan - he had a bigger plan in mind than simply having power for power's sake. as Chaos said - HK-47, disciple, and GO-TO as the most prominent.
Yeah, Kreia isn't the most trust-worthy character, but keep in mind that as the Exile was her student, you'd damn well think she'd want her to learn from her past students.
Of course, we can always revert to the same generic Sith Lord right? I get it that the OT ideology is great, but it might be great to also have a Sith Lord who isn't exactly simply drawn to power for power's sake.