gran turismo is to much of a high profile franchise for anyone to compete against it, you only need to look how much content that goes in to the games.
i expect gran turismo 5 to have more content than gt4.
forza 2 is also a very good game, some in fact prefer the forza series because it offers some diffring gameplay mechanics, but gran turismo is the #1 racing game.
if polyphony announced gran turismo 5 launched on same day as forza 3 date, i predict that microsoft would have no choice to delay forza 3 as it would be suicide
...not much time to post anymore, used to be awesome on here really good fond memories from VGchartz...
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really miss the VGCHARTZ of 2008 - 2013...