Have about an hour you want to waste?
The Sims, basically let you play god by controlling one sims life, fun in writing, not so when actually playing the game.
Superstar is the same thing, only you try to become a star in music, acting, modeling, yeah yeah yeah. If you could actually crash and sleep on a bench outside of the studios it would be a little more nice than actually having to go back and forth wasting a lot of time, but then again its real life and you don't have a car, just a substancial amount of money and a phone to call a cab.
Superstar, just another waste of time, if you enjoy the series and it somehow doesn't bore you to death with repetativeness you actually might want to pay less than $20.00 for this expansion, its just not worth anything if your not a fan or can endure long hours of nothing.
Go read a book, you'll get more satisfaction.