Perfect 10, in both the US and UK reviews.
So its, like, pwnted everything.
Mario Galaxy, Halo3, CoD4, BioShock, Mr Driller Online, everything.
US review.
IGN: Grand Theft Auto IV Review
UK review.
IGN: Grand Theft Auto IV Review
'Without question, Grand Theft Auto IV is the best game since Legend of Zelda: Ocarina of Time.'
Ocarina of Time is the highest reviewed game ever, on average, on GameStats.
So it is good then.