Before I start I'd just like to say that I loved Forza 2 and that Forza 3 is going to be great. I'd also like to say that Turn 10 and Microsoft have brought this on themselves with their big mouths. You can't go making ridiculous claims without having substance to back it up. I'l do a simple list to show how from a standpoint of features, Forza aint the one that's 'definitive.'
GT5 VS FORZA 3
More Cars vs Less Cars
More Tracks vs Less Tracks
1080p vs 720p
60fps vs 60fps
World Rally vs No Rally
Weather System vs No Weather System
Night Racing vs No night racing
Top Gear Test Track vs No Top Gear Test Track (This is important to some UK folks)
Nascar (although prolly only 16 cars) vs No Nascar
Can be used with alot of steering wheels vs Can be used with a few steering wheels
16 cars on track vs 8 cars on track
Little car exterior customization vs Full exterior customization
Almost CGI graphics (the trailer was 'real') vs Amazing graphics
No/Little tyre deformation vs Tyre deformation
Probably little damage vs Full Damage and Car rolls
..........Doesn't look all that 'definitive' to me.
And, then people who think they are experts will say...'but Forza handles more realistically, it feels like a real car' etc etc. Although personally I fell like Forza is more 'arcadey' I rekon it does a very good job of this, but it's not as if Gran Turismo isn't the real deal.
Here's a video you should watch showing how realistic GT5 is. It's a video from Prologue but it does a good demonstration of how accurate things are in GT. This carries through to all cars, not just the F1 car. I hope Turn 10 have learnt their lesson.

















