Must admit gt5 was disappointing when I first got it, same old floating, ploughing on through corners feeling. I think NFS gives a better feel like the tyres are actually on the Tarmac and the blur when you go really fast actually gets your arse going whereas gt5 high speed just doesn't feel real.
I do like the different cars you can get and love the used car sales.
I got quite far and have found myself needing something mega but not wanting to sell all my rare cars