One thing I don't think the show portrays well is the characters ages for example in the books:
Jon Snow: 14 close to 15
Robb Stark: 15
Whereas in the shows they look much older around they're 20's. But in the book Jon Snow still had steadfast morals and a high maturity for his age. Which makes sense considering as a *Bleep* he is forced to grow up if just to be hard enough to ignore the jibes and comments thrown his way