Would've got this way sooner if I knew all the build/buy was Art Nouveau inspired!!!!
I'm a bit biased towards this DLC as a huge fan of that design style, but I have genuinely found the rest of it enjoyable so far. I was skeptical because some people said there wasn't much new content added, but I kind of disagree with that. I do agree that the world and the magic realm added are a bit small, and there are a few buggy things like the duels that can be a bit of a pain. It would also be cool if other forms of Sims could be Spellcasters instead of having it as a life state.
However, I personally find being a Spellcaster to be a lot of fun for being a chaotic individual (I have burgliated and inferniated so much stuff) and just for some general convenience things. The CAS isn't anything too special, although I really like the accessories. And although they are admittedly quite useless and I wish more was done with them, I do love having familiars following me around. I think it's a fun showcase of the current Sim's personality. Or maybe I just really want a pet raven. Anyway.
TLDR, I think the good outweighs the bad of this pack. I think the build/buy is beautiful, the CAS has its moments, and the features added are a lot of fun despite bugs and things they should've taken further. Buy on sale!!