All I can say, the reviews said it wasn't as good as it was supposed to be.
Yes, this game got 9's and 8.5's, but that was not what we were expecting. With all this facial technology, gripping story, and enviroment, we and the developers at Rockstar were expecting 10's.
Now my opinion is that this game ranks about a 9. Everything was amazing, but once you reached the 14 hour mark (out of the 22-24 hours), you loosed some amazment. 18 hours into the game, you found it to be a bit repetitive. Once you reach the 20 hour mark you want to yell "I want to find out the ending already!!!".
I think that this game was a bit underestimated. This is my honest opinion. Hope this answers your question.