To be honest, I've never really been this into The Sims until this version came out. My main reason for buying was for the fact that holidays have just began, but if you really want to enjoy your holiday, don't buy this game, you'll spend it locked up in your room playing The Sims 3 for hours on end. I've read a lot of reviews, the majority saying that this game totally rocks, and I guess The Sims 3 lives up to it. It really does take SIM-ulation to a whole new level, flirting with death, becoming an Astronaut, robbing other Sims, become a kleptomaniac, even earning life time rewards where you may spend them on such things like “steel bladders” so you never have to use the bathroom again, or the “fertility treatment” so your Sim has a much higher chance of having twins/triplets/quads, etc. One thing I really like about this version of The Sims is that now we can really set our focus towards building and enhancing skills, there are about 11 different areas (some include Handiness – a skill which, if high enough, allows your Sim to repair things without getting electrocuted to death, or there's Cooking – a skill which, if also high enough, allows you to cook the ol' Tri-Tip Steak without burning it or lighting the place on fire, or there's Gardening, Writing, Logic, Guitar, Painting, the list goes on). It gives you a lot more freedom to do what you want than any other version. Although, what is good news without bad news? There are some down sides to The Sims 3 as well. Right now we have very limited Neighborhoods, one in fact. Or two if you download the free one from their website. They are, however, releasing software to allow people to build their own Neighborhoods (it's the same software which developers use, which is good {great for tech-savvy users who can manipulate their way around the software} and bad {not so good for the faint hearted}). I also highly recommend The Sims 3 – World Adventures. This really makes the game come alive. Check out reviews for WA. ;)
Overall, I'd say the positives outweigh the negatives by far, that's being said that the main disadvantage in the game as of right now is being fixed this month anyway.