Impressed by:

Most of the long sequences, especially through the trenches and the final assault. Alas some (e.g. tunnel, run through 'village' lit by flares) were over-long

Most of the CGI, but some (E.g. rat; collapsing tunnel, run through 'village' lit by flares; waterfall) were pretty dismal.

Most of the acting (but why, oh why Cumberbatch again? I just don't get it. Surely he's just included to add to box office takings?)

A film worth watching, but not a game changer for me.