Not only does The Black Adder show a face of Rowan Atkinson that is apart from Mr. Bean, it shows a way funnier one, to my mind.
This is sitcom at its best. Mean, sarcastic, sometimes even cynical, but always funny. This is not somekind of sophisticated humor, but still it is above so many other comedy-shows.
And the ending of the last episode, of the last season must be the best ending to a sitcom ever.