Definately one of the better and more content-full packages that The Sims 2 expansion packs has to offer.
That's just a method of mine using this expansion. Car's are pretty cool, but pointless as they're so expensive while they just provide previously free services.
Another cool think introduced in Nightlife is the ability to become a vampire, which makes a Sims life a whole lot different. They have to sleep in coffins, their skin becomes chalk-white, they usually resort to wearing evening gowns 24/7, they can turn into bats and they can bite others to make them vampires also! Every ones happy.
All in all, Nightlife is one of the better expansion packs if you're looking for bang for your buck. Nightlife get's an 8.5.