Not as good as the base game / first DLC
Sadly, the Lemurian Vampire is a step down in quality from the base game and the 1st DLC.
First, the cases simply weren't as interesting. This is probably because we already know the overarching story, as the 2nd DLC fills in the story gap between the 1st DLC and the base game. But since we already know what happened before and what happened after, piecing together the gaps just wasn't as fulfilling.
Second, the logic of the cases didn't feel as tightly put together. There are a number of logic panels, for example, that felt unrelated to the case itself. And some of the panels require logical leaps or assumptions. By comparison, the case logic in the base game and 1st DLC felt much more tightly put together.