The audio drama for Dark Lords of the Sith is just as much of an improvement on the previous audio drama, Tales of the Jedi, as the graphic novel was on its predecessor. This means it is better but still not all it could be.
The writing has improved, especially since it was based on a graphic novel who’s writing had also improved. However, the difficulties involved in adapting a work to an audio drama have resulted in a little melodrama here and there. Even though many of the voice actors have toned down their enthusiasm which helps in a lot of ways. So it is a little more serious than before but a lack of visual information means that much of the dialogue becomes a bit cheesy trying to describe everything.
Overall, it has improved, but there are still a lot of other audio dramas that are much better that I would recommend long before I’d suggest Dark Lords of the Sith.