Dirt 2 looks absolutely stunning on consoles, i wouldn't be surprised if the game ends up looking very close to this trailer, i would be if PC version didn't, actually.
Also, Dirt 2 was a decent to good arcade racer, with a simplified driving model which, at least, made some sense and provided some fun.
Dirt 1 was completely broken, car's reactions were completely incoherent, unpredictable and often made no sense; counter steering could either halt your car on the spot or leave you sliding sideways and off a cliff (same speed and terrain). Hitting the brakes on a straight would send you sliding forward forever but switching to Reverse instead had your car go from moving at 80mph forward to -30mph in Reverse in a matter of inches.
D2 was a huge improvement and i might pick 3 up, although i was expecting and hoping for a new Grid instead.