that's the complaint I hear about Martha all the time, but I never really cared about it when I was watching. I liked Martha because she actually made herself useful - using her medical skills to help people (and aliens) across time.
And that's not to mention what she goes through in the finale, and what happens to her because of it... tragic and awesome.
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http://myanimelist.net/profile/angryaria
<Die the death>! <Sentence to death>! <Great equalizer is the death>!!