I can see both sides off this, and frankly it doesn't matter. (did I say that)!
In one camp this is unfair because it's a full game vs a prologue or demo!
In the other camp it's if you paid for it then it's a full game vs full game, and it's the best simulator in both platforms.
Now for the record, I've never played Forza. I very nearly bought an Xbox and Forza, but chickened out in the end because the wheel support was crap.
I know that Fanatec have resolved this, but I have significant investment in a wheel and race frame that I'm not giving up just to play Forza!
Frankly these days I don't play GT5P either, why.. I'm bored with the circuits, and online is pretty much as bad as any online pc demo, destruction derby anyone - only without the destruction.
So where does that leave me..
Well I'm running rfactor, and other PC sims, in closed race servers online. pick your community and race what you want. great fun and polite racing.
Last time I raced GRID - PS3 on line, I had to put up with the Muppet who spent the whole race talking and swearing at everyone through his headset.. who needs this mentality!!
we talk of Physics... I've never driven most of the cars in these sims, I don't have a degree in mathematics, I can say that I thought the S3 in GT4 was close to my own S3, but only after I changed the power wieght ratios and turned off all the driver aids... Was it great physics.. I don't know.. It did feel good though.
So does physics/feel really matter, yes cars should feel different as they do in real life. FWD, RWD, 4WD all feel different. Front mid engine cars etc.. It's nice to experience this difference.
When GT5 is released will it then be a fair comparison?
NO
you'll have the very latest software/hardware technology (GT5 / PS3) vs a stack that's designed arround a platform thats now years old (XBOX/Forza).
The Thought that GT5 might go multi platform is frankly music to my ears.. Now I can upgrade my technology when I can afford a better platform and see the benefits in the game, I'm not tied to an old platform.
What's my PS3 doing now.. it's a media centre playing files from my NAas box, movies, videos and Music.. GT5 we'll have to wait and see...
personally I think in the end the SRT view was fair given where we are. It's about time that we saw more from GT5, if it's still work in progress make the rest downloadable content, and let's enjoy it. Why wait till it's complete?