I am a big P&P fan so I came to this series prepared to love it, although I wasn't a great fan of the book.
Could someone not have had a chat with BBC execs about age appropriate casting? Anna Maxwell Martin was a full ten years older than what Lizzie would have been at the time of the story (i.e. A few years after marrying Darcy at 21). She's a good actress but she definitely looks her age, so she can't play a girl in her mid-twenties. Added to this, she looks tired and dishevelled most of the film, as you'd expect a Dickens character to look, not the witty, happy and bubbly Elizabeth Bennet. It's a complete miscasting and honestly very distracting.
Darcy is also miscast - he is a bit more put together, but has the wrong countenance for Darcy, he does not come across as the imposing figure he is supposed to be.
Georgiana Darcy and Lydia Bennet are far better casting choices, they play their characters fairly well and most importantly look the part (and are the right age...). However Lydia is portrayed as fairly self-aware and certainly not the "silliest girl in Britain", Georgiana is far too relaxed and "modern" for the times.
Add to this some silly plot points, and it's a no from me. However much I enjoy Jane Austen adaptations, this one misses the mark.