This may well be the best Sims game to date!
The Good:
Sims feel more human with the new traits system. Creating a sim is much deeper, and more variety in appearance. Create-a-style is very impressive allowing the player to fully customize the look of the game. Much easier this time around, less worrying about keeping your sim alive, and happy more about doing what you want. City truly feels alive, being to explore your city is great! Sim 3 store prices are rather cheep. (DLC is cheep.)
The Bad:
Path finding issues. Having to buy furniture, clothes, hair styles, ect online in the Sims 3 store right from when the game came out. Not being able to create your own neighborhood.
Overall the good far outweighs the bad. With patches much of the earlier complaints are fixed. DLC is very nice, shame a good amount of it came out when the game did. Cant see why they did not just put it in the game. A vibrant new world for your sim to grow up in and many more choices for them. You can create any sim you desire, a rugged athlete, a nerdy scientist, or just a bum on the streets the sky is the limit! Veterans and new comers will love this game. I highly recommend going out and buying this game today.