Martha, for most of the series, didn't seem to view her trip as anything other than an interesting vacation with a hot guy that didn't cost her real-world time away from home.
I guess I'd ask why that's a bad thing. I mean, I certainly think that she comes to value her travels as more than just "hanging out with a hot guy," but from "Smith and Jones," it's set up that her time in the TARDIS is limited. That doesn't mean that it doesn't change her--I think it makes her more awesome, since at the end of S3 she saves the world with basically a glorified wrist watch and a key, and it makes her more sure of herself by the end--but Martha, unlike Rose, is a character who was always going to leave the Doctor. She was always going to come back to her studies, so she hasn't thrown them away. It *is* a vacation for her, in that it's a time away from the life she was leading. And not studying doesn't mean she's not a "real student"; it means she's on a break. Which is a luxury you can have when you've got a time machine.
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I guess I'd ask why that's a bad thing. I mean, I certainly think that she comes to value her travels as more than just "hanging out with a hot guy," but from "Smith and Jones," it's set up that her time in the TARDIS is limited. That doesn't mean that it doesn't change her--I think it makes her more awesome, since at the end of S3 she saves the world with basically a glorified wrist watch and a key, and it makes her more sure of herself by the end--but Martha, unlike Rose, is a character who was always going to leave the Doctor. She was always going to come back to her studies, so she hasn't thrown them away. It *is* a vacation for her, in that it's a time away from the life she was leading. And not studying doesn't mean she's not a "real student"; it means she's on a break. Which is a luxury you can have when you've got a time machine.