I watched this with my 12 year old and we enjoyed it way more than some on here.
I saw it more like a theatrical play, and so the colours and the lack of dirt (how did those soldiers keep their trousers so white!) and the comedic costumes all contributed to the sense that life is a game.
Underneath all that colour, though, was the point where I disagreed with Thackary/Palin's message- what she was striving for was worth having, because Becky had nothing, and so for women who had nothing, they had few choices- become a governess and get hit on by Pitt the elder (sexual abuse/harassment of servants being common), try to marry well, try to run a business (which Becky does without any actual money behind her) or basically sell yourself which is made clear what has happened with Lord Steyne. What real choices does she have than to suck up to privileged people and hope one of them takes pity on her. Even Amelia is in the same boat, depending on Dobbin's money for years. These are non-economically independent women, it looks terrifying to me.
The ending- the two 'players' , Jos (who may well be gay or just very camp, it's unclear in the adaptation) and Becky are shown together. It's not an authentic ending, but I kind of liked it.
I don't always want dreary brown dresses from the BBC costume department, so I quite enjoyed this one!