At the outset i'd just like to say that
A. I know a trial doesn't present the full game
B. I know that FM4 is FAR better than Shift
Honestly, I played the trial a bit at my mates house, to see if I'd actually want to got to the hassle of buying an Xbox, paying for the Live subscription, and then buying the game.
Whatever the track was that it lets you drive on (A fictional Swiss track with lots of banking) seemed very... Not track-like. Reminded me a bit of NFS Hot Pursuit (The older one from like 2004)
Also, the Ferrari 458 looked fantastic, but it seemed like there was absolutely no mechanical grip. The back felt obscenely loose, and I ended up having to drive like I was playing Shift, trying really hard to go not spin the rears, or just get rampant oversteer.
"Well, noob, thas ust cuz u wuz drivng th 458. It MR"
Fair enough.
But then I switched to the Subaru Impreza, and it felt much the same. Loose, and slow to respond up front. The steering didnt feel as crisp or as precise as GT5.
The only other car it allows you to use is some sort of Chrysler Corp. (Could have been Dodge or Plymouth) 70's muscle car. I could tell that the problem was compounded when i switched to a powerful, heavy, muscle car with poorly designed suspension. But thats when the game began to grow on me a bit.
I was in love with the Higher frame rate than GT5's, and also I loved how nice the cars looked. Everything looked fantastic.
But then, on closer inspection, I find things that are alluded to above. PD took the time to put in individual stitches on the interior. Every little detail is there, and if you really look at it, you get a good idea of the depth of the graphical design and pride they take in making everything look realistic.
The panning shots on FM4 look simply amazing. But up close, the cars just don't have the same depth as GT5's(Excluding the standard cars, obviously.). Still photos on GT5 are eerily similar to the real thing, in fact I have fooled several people with shots such as this
I have yet to see a Forza photo look that real. But, I have yet to see a GT5 video that looks as nice or neat, or real for that matter, as ones from FM4. The lower frame rate really kills it.
All in all, I'd say they're different games for different people. But really, why can't you guys just be content? It's another great racing game for people passionate about cars.