I like Martha, or at least the idea of her.
What was the idea of her beyond hot chick who fancies the Doctor?
Admittedly I suppose 'potential' would have been a more fitting word. However what I saw in her first episode was an independant, smart medical student who was very much in control of her life and feelings. Who then got turned, throughout the run, into the exact character you just described.
I seem to remember RTD mentioning during one of the podcasts, that were released after the episodes aired, that Phil Collinson wasn't a fan of what he did to Martha, mostly the 'unrequited love' angle, that became the whole focus of her relationship with the Doctor.