I forgot some details:
-More, more, more, and more cars! GT isn't complete without the wide assortment cars (at least 3,000 cars or the one featured in GT2 is only 6% of the total of my dream GT).
-More realistic tire screetches (excuse my spelling).
-More short tracks based on long tracks (Autumn Ring, Grand Valley, and Special Stage R5).
-More downhill (Drift or Rally) tracks.
-Let it not be boring as GT3.
-More, more, more, more, and MORE CARS!!! (sorry I can't help it)