This series show great detail of medieval life together with a good intrigue. Facts and society are depicted quiet accurately, and you feel immersed in the XIV century Europe with all it's complexity. The scenario doesn't rely only on the usual fantasy theme we found in medieval stories and I found it particularly refreshing. In each of the 8 episodes you'll find a small story dealing with medieval aspect (Lords/serf relationship, inquisition, everyday quarrel between villagers etc etc) together with the continuation on the main action/scenario that last throughout the 8 episodes.
Most actors are very good, at the exception of the lead actor that sounds sometimes a bit off the line, but it doesn't diminish the total quality. Filming is good, not much fancy but the director does the job.
It's definitely a must see for everyone liking medieval or historical actions, only drawback you've got to speak french. As the excellent mini series "Les Roi maudits" (i'm talking about the old one from late 70's which is a real chef d'oeuvre of acting, and not the new one from 2000's which is crap in comparison) was worth the viewing, I honestly believe "La commanderie " deserve a thumb up.