This is definitely my favorative expansion for Sims 3. Each life state adds so many more abilities and possibilities for supernatural storytelling/gameplay, it's crazy! I actually didn't expect much from this pack, but really glad I picked this one. The werewolves and vampires are what I would expect so playing them is fun, but not too tricky. The witches are great, but it does take a while for them to learn new spells. My favorite life state is probably fairy. Seriously entertaining just dropping a fairy or two into a household and watching what they get up to. My least favorite life state is ghost, simply because, well, they ARE ghosts so some of their options are limited (for example, ghosts and living sims can't have babies).
The zombies aren't too worrying. They appear automatically during a full moon, but you can adjust the moon cycle or turn it off entirely. They mostly just growl at other sims then wander around the backyard. If they get into a garden, they'll eat the plants, but if your garden is gated and set on lock to everyone outside the family, then it's no worries.
The new town is great. I don't think it's one of the most beautiful towns of the expansion packs, but it definitely adds some epic Victorian styled houses, some nice clubs and other supernaturally themed venues, and an overall creepy feeling. Also, great selection of new clothes, hair, and furniture to choose from. You can even set how much body hair you want your werewolves to have when they're transformed.