And what happened to Bastila? She was also tortured and had what was effectively her home on Dantooine destroyed. She will also have to live (if she does live) with the memory of having become everything she dedicated her life to fighting. All to save the man largely responsible for the near destruction of the Jedi Order and the republic.
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bastilla FAILS... she succumbs to malak's torture. you not recall that? and as to dantooine being destroyed, did anybody here feels bad for her when that happened? did she seem as if she were really saddened by such things? 'course maybe you can argue that as a jedi she would not show emotion... but did you, the reader feel particularly bad 'bout dantooine? is just one of the examples of bad writing in kotor. heck, unlike leia who is told that "in a way" she has chosen aldderan to be destroyed, you find out that dantooine is glassed regardless... has nothing to do with you.
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You were talking about sacrifice, not success or failure. You cannot dispute that Bastila did show willingness for heroic sacrifice when she allowed the PC to escape from Malak.
As for success or failure, accusing Bastila of failure is like accusing the spartans of failing at Thermopylae. She was a young and low ranking Jedi who would never have any chance of resisting the dark lord of the sith even in the best of times. Her "failure" just made her sacrifice greater, for she gave up not just her life but her soul.