The difference in the way the Doctor is written by RTD and Moffat.

Companion: I am so rubbish. 

RTD-written Doctor: No, you’re not! You’re brilliant! Remember that wonderful thing you did! Remember that special skill you have that nobody else has? Don’t put yourself down! Where would I be without you, eh?

vs

Moffat-written Doctor: You are bossy, also a control freak, a narcissist, a game player, needy, and also your skirt is just a little too tight.

Companion: Excuse me???