... because RACECAR!

I (pre)purchased Forza 4 last week and boy am I happy with that decision. This game is great. The car dynamics are awesome, the sound is a definite step up (engine sounds change as you change things like exhaust, bore, turbos and also match engine load like when bogging down and F class 3 cylinder going up a hill) and the graphics look like they belong on a next gen console, not the same Xbox 360 I play Forza Motorsport 2. It doesn't feel as aloof as Gran Turismo 5 and is still fun if you aren't a gear head (although it does lack in the "just drive around and try not to hit too many things" mode category). If you are a real petrol head though.. a little bit of scratching reveals that just under the surface is big rabbit hole of tuning options to allow you to squeeze every millisecond out of your lap times. The partnership with Top Gear brings a bit of lightheartedness into some portions of the game.. especially the otherwise mildly boring Autovista feature that lets you explore highly detailed 3D renderings of some select vehicles.
In the spirit of expensive feats in engineering going wicked fast.. I bring you the WORLD'S GREATEST DRAG RACE!