Forza 3 raises the bar in about every way, if you're new to gaming you should pick this out before buying the new Forza4
Forza 3 for the 360 is one of the greatest racing sims out there now. I know Forza 4 came out a short while ago but in my opinion it is really like Forza 3 version 2.0. For those new to gaming and are looking for a great game that even if you're not a fan of racing you'll appreciate, Forza 3 offers everything and can be purchased at a bargain rate instead of delving in and spending $50 for Forza 4. I'm not saying do not buy number 4 ever, but give the 3rd entry a try and who knows you'll enjoy it for months and eventually purchase Forza 4. I myself have not bought it yet but i played the demo and while things are updated, a little more features, etc, it's almost playing the same game, so i think i'll wait before i buy it.
Anyway, if you happen to stumble upon my rather short review or lengthy opinion, then thanks for the read and let me know what you think!
-Michael