Pros:
+ Great driving physics
+ Motiviation is pretty good: after only 3 races, the car can be upgraded free of charge and you do not muck around in meaningless Driving around the time (!).
+ Opponents very well, not too stupid not clever
+ Very quick upgrade (automatically possible to the next level) and voices, no misery long Clicking any options more (if cares really!)
+ Have 3 and 4 when I got 4, I switched immediately.
Cons:
+ Forza 4 is a Forza 3.5 (not necessarily negative)
+ Autivista is quite free (for what?)
+ Routes are a bit scarce
+ Mid-engined cars rather scarce
+ Rally cars are completely absent
+ Rain and mud anyway has always been
+ Whether the features, like stickers on the car, who needs, I can not judge, I do not need that, I have the classic colors (yellow Countach :-) enough.
+ And what extremely bothers me are the few classics like. Peugot 205 Rally, Mini Cooper, old Mercedes, Lancia, etc. Available are for example. (List is not quite long) (to buy Quattro must) Audi 100, Renault 5, BMW635CSI, Lambo Countach, BMW 2002 (sailing right) Fiat 131 Abarth (Fiat are only 2), Lotus Esprit and just a few more. Some are only for sale, so very meager bottom line. Even the Volvo 850R must be purchased!
And that bothers me extremely: the new high-performance cars and touring cars are already quite well, but in principle, not for me, because here simply the "grip" is missing. To throw a Renault 5 in the curve is certainly nicer to drive than a Veyron. Or dahinzusegeln the BWM2002 230kmh, where you can feel really, how far is the car in front of the take-off. Or with a tuned Lotsus Esprit driving (mid-engined) in a race with equivalent new car (like BMW M series).
But 5-star, is nothing better on the Xbox 360, unfortunately :-)