Supernatural brings everything strange and spooky you can possibly think of to the sims - vampires, werewolves, witches, ghosts, genies, zombies, aliens, and even fairies. There's new interactions for cursing or helping other sims, and with the introduction of the alchemist's table you can either make potions to help or harm your sims or make a career out of making and selling potions. There's also the introduction of moon phases, and once a full moon sets in everything strange comes to life.
So why did I title this review as fun and frustrating? Well it's fun trying out new interactions with my sims, but when it comes to a full moon all hell breaks loose. On sim creation the game randomly allocates whether or not that sim will suffer with a Lunacy buff during a full moon. This lunacy buff makes your sim behave like a lunatic, which means randomly hugging or slapping other sims, constantly changing outfits, wearing odd combinations of outfits (eg. wearing pyjamas in the bath), and freaking out every hour even when sleeping. Also your town will become invaded by the living dead, putting all your outdoor crops at risk. Unless they're planted indoors or in a garden which is locked to all other sims you can kiss your crops goodbye as zombies make a feast out of them.
So, overall not one of the best expansions in my opinion and spoilt by events that mess up my enjoyment and require me to remodel my home to prevent zombies from destroying my crops.