GMR-Source has posted their review of Gran Turismo 4, giving it a overall score of 9.5 out of 10.
"GT4 is a really great game. It expands on the great gameplay in earlier games, but improves the graphics a great deal and adds a easy-listening soundtrack. Thereís nothing here that seems out-of-place or awkward, a rarity in most games nowadays. It doesnít have much useful or good stuff that isnít in earlier games, but it still manages to present a sense of its uniqueness."