They were comparatively poor in the 50-50 balls and lost the majority of them. Dahoud, Bellingham and Malen were not impressive.
Borussia Dortmund were by far the better team on the pitch in every sphere be it attack or defence and won the match deservedly. Besiktas would like to improve in certain areas as they could not pose much of a threat. Bellingham was arguably the player of the match with a goal and an assist.
If you want to download the stats in PDF format you can do it here: UCL Stats Analysis: Besiktas vs Borussia Dortmund