My Review:
The sims 3 supernatural adds new lifestates to the game, the main lifestates are:Ghosts,Witches,Fairies,Zombies,Vampires, and werewolfs. There are 6 new traits(that I know of) and they are brooding,supernatural fan,supernatural skeptic, gatherer, proper, and night owl. The game adds air conditioners, but they would look weird inside of a house and you can't actually do anything with them. There's also a few new skills like alchemy, and, well, that's the only one I can think of right now. Witches, Fairies,and werewolves, will gain new abilitys as you use them.(ex, fairies eventually get bloom which is a thing you can use to make a plant grow up quickly and to me is the most awesome feature that they have.) There's also little touches to the game that are cool like the beekeeping box, the gem cutter, moondial, mood lamp, the claaaaw, rocking chair, and I'm guessing other things that I'm just forgetting. Also, with the moon phase, it's not only werewolfs that get a moodlet. The new career is a fortune teller. There's also a few new community lots. Red Velvet lounge, The toadstool, um, I can't remember the others. But I love supernatural!
Edit: Wow, I feel stupid sometimes, I also forgot to add that there are population controls, and if you don't want zombies, you can set the moon to a phase that is anything other than full moon. But I wouldn't recommend setting it to new moon if you have a fairy becuse I think that gives them a negative moodlet.