Honestly, it's not really worth it. EA loves to mess up with bugs and patches all the time. Honestly, you'll want to buy more and more expansion packs to fulfill the emptiness you get from the game. More and more content and you still feel empty. It's a never ending cycle and will bring you back in middle of the night to make sure your obese green vampire family finished maxing out their Cooking skill.
Or you just might lose interest in it and never play it.
EDIT: If anything, get Sims 2. The supernaturals are a lot more fun and stuff. Plus it was Maxis before it's early death.