I've concluded that I really need to watch this twice - the first time for the storyline and excellent dialogue and especially for the witticisms of the Dowager Duchess of Grantham (Maggie Smith).
A second viewing would be to simply admire the gorgeous, intricately designed costumes.
Of course, no period drama is complete without a little romance. The gentle relationship between Bates the valet and Anna the head housemaid is just lovely.
I'll be sorry when I've finished this. I can feel a need to rewatch the BBC production of "Pride and Prejudice" coming on.