I could not get angry at Natsumi for his indecisiveness and lack of courage because to me they were logical. Every time he tried to grow or assert his views or something, he would get shotdown by Takabe. Even as going as far as suckerpunching him when he was at his lowest.
So Takabe angered me more. Saying that he loves Natsumi and so on, when he only supported him as long as it was beneficial to himself.
So I liked the fact that Natsumi, despite having the people he hold most dear against him, he was able to grow.
And I agree with you, the translation was amazing. I like the fact that they didn't just say "I don't understand this I'm not gonna translate it" as I saw in too many translations. And I also like that the mangaka did a thorough research in the subject since every time I see a doctor portrayed in any media they usually jump the shark and it just makes me lose interest in the whole plot.
Coming from a medical background, I hesitate to read manga about doctors - usually. I'm pleased to say that this manga was well researched and well written. (well translated too - medical terminology can't be easy to translate, unless you are in the field.) Sensei drew me into the story and characters well enough that I was angry at Natsumi's indecisiveness and lack of courage to stand up for himself. Then, I was proud of him when he did.