I can't really say much more than anyone else has said.
I love humour and intelligence, so them combined is perfect for me.
Though I have to say, on pages 90 and 91 (have not yet finished), they have a fact wrong in regards to the Black Plague and the Great Fire Of London (1666). They mention the correction in series 7, episode 10, 'Greats' (perhaps the XL version, I am not sure). Least they corrected themselves though!