I guess this is supported by the fact that it is quite hard to talk down from the dark path, as virtually the only one who can do it is the male Revan who was she in a relationship with - and again, she's not doing it for the Jedi or the Republic, but because Revan asked her to do so. I wonder if she comes back to the light fully, as she again gives in for her feelings.
Actually, that's not true. You can quite easily turn her back to the lightside even as a female Revan (done it just about every game I've played) you just have to choose the right dialog options when fighting with her. I think she does. I like to think she realizes that Malak used her just like everyone else did. I like to think Bastila realized that both extremes are bad and neither side is completely "right".
@Xtreme-Void Malak played on Bastila's own fears and faults to turn her to the dark side. This doesn't make her a bad person, just flawed like normal people. Like Carth, Mission, Zalbaar, Jolee, Canderous, and Juhani (especially Juhani, have I mentioned how much I love Juhani?). And like Atton, Mira, Bao-Dur, Visas, Mical, Brianna, and even Kreia. Hell even Darth Scion in interestingly flawed if you play as a female Exile.
I also suggest you play KotOR again as a female character and romance Carth, maybe you'll get to see another side of him. You know the side that was bruised by his friend and mentor murdering his wife and son (or so he thought, his son is still alive), the side that feels completely helpless when it comes to all this crap with the Force etc. And the conversation where he apologizes for being a little bit of jerk. I can't remember if you get this conversation if you play as a male character, as I don't like Bastila's romance. Too much weird mental crap happened between the PC and Bastila to make me feel comfortable romancing her. And I felt like Juhani was a closer friend to my female PC (Have I mentioned I love Juhani?).
You know, I'm glad BioWare stopped doing that. Closing off content to PC's of the "wrong" gender. I mean Dorian and Cassandra were my female inquisitor BFF's and Dorian is gay and Cassandra is straight so it's not like I could romance either of them. It was nice to have a real friendship path. Unlike in KotOR, Bastila never felt like my PC's friend, not really. Same goes for Carth when I played a male character. Atton was different though, I felt like his friend when I played my male Exile. Of course there aren't any real romances in KotOR II. And it always annoyed me that the game automatically thought my Exile's should love/was in love with Atton or Brianna (depending on gender) when really my Exile's were in love/interested in Bao-Dur and Visas.