I disagree. Unless you are using some mad shorthand for only a few little comments, you will spend a considerable amount of time with your gaze down at your notepad as you scribble away. While you write, you are not making eye contact, and are probably not speaking/answering Q's or paying full 100% attention. Worse thing you could ever do is be asked a Q while you write, and have to say: "Excuse me? Can you repeat the question?" because you weren't paying attention. That's shooting yourself in the foot in my opinion (more like shooting yourself in the descending aorta). Plus what could you possibly have to take notes on DURING the interview? Wait until it's done, then find a quiet spot you can sit in for five minutes and then take a few notes on pros and cons, answers to your Qs, etc.
Bring pre-written Q's to your interview that you would like to ask, and some blank paper in case you actually have to write something down. But try writing as little as possible.
Maintain eye contact and pay attention to the entire interview.