This game is fantastic, so addictive and yet so much fun!
1) I wanted my sims to have a car, waiting for taxis and waiting for the carpool every morning was becomming a drag, and at least this way I can choose and download new and more modern cars for my sims.
2) VAMPIRES! I loved this idea and its fun to go downtown in the middle of the night to bowl and have dinner with vampires. The only downside is finding vampires. I personally prefer my sims to get bitten by vampires than becoming one via a cheat.
3) The outfits. It can be really annoying when your sims dress in the same plain outfits, but with nightlife I got a wider taste in outfits that my sims can wear when going out. There is even a person vampireish one that is relatively interesting, but remind me more of something that a queen would wear.