This is one of those shows where it's obviously meant to be targeted towards those familiar with the franchise, so if you don't know much about Touken Ranbu, you might want to either skip this or otherwise try to familiarize yourself with the characters/ setting beforehand.
This show does the absolute bare minimum in introducing/ establishing the setting and characters as it assumes the viewer to already be familiar with them and their general relationships/ dynamic with one another. As such, watchers jumping into this without any prior knowledge of the franchise will most probably be left with either confusion or annoyance/ frustration as they try to make sense of who the characters are and why they (the viewer) should care about them/ their struggles, especially moreso when there's such a large cast and new viewers have to figure out who's meant to be a main character and who's meant to be a supporting character.
This anime is meant to be an adaptation of the Touken Ranbu stage play; however, it does not follow the stage play exactly and instead omits certain plot points (Sayo's fixation on revenge) or puts them in the background (Yamanbagiri's self-doubts about being the attendant). It adds a few differences here and there, but the main points of the stage play are still present. If you've watched the stage play before, it's a decent enough adaptation that's worth the watch as it does adapt certain key scenes from the stage play and gives a bit more insight on the focused characters. If you haven't watched the stage play, then it does a decent enough job of getting the story across and can serve well as a general starting point to garner interest towards the actual stage play continuity.
The primary focus of the show are the swords of Oda Nobunaga, primarily Fudou Yukimitsu (the main focus), Souza Samonji, and Heshikiri Hasebe. Of course, they include the other fan favourites such as Mikazuki and the starter swords, but the Nobunaga swords take most of the spotlight.
Despite being a short anime of only 8 episodes, it can get awfully repetitive as the story moves extremely slowly with little to no development of the characters themselves until near/ at the very end, and even then, the development comes across as rather abrupt and maybe even confusing.
The animation and animation quality itself is pretty nice. The fight scenes are animated quite well, using 3DCG for the enemies as well as adopting a few stylistic choices here and there.
Overall, it's a decent to good show to watch if you're an existing fan of the franchise; otherwise, if you're new to the franchise, you might want to reconsider watching this or try watching the other Touken Ranbu anime (ex. Hanamaru and/ or Katsugeki) first.