Analyze This, and Analyze That? De Niro definitely shined, just like all his other movies.

I haven't seen any live interviews of him other than in the past couple years, so I wouldn't know if that is how he usually is live. I know him from his movies, and in movies you are able to memorize your lines and do shot after shot until you get the perfect scene. There are some very sharp people who take their time when speaking. Maybe he is just one of them.