If GTA4 isn't a 10/10 game, why did it get reviews like it did?

[Dr.Grass]

I found GTA4 a pain to play. Didn't like the mood of the game and the gameplay felt twitchy. I played it for around 30mins then I sold it.

My view is (of course) subjective, so I'm entitled to say that for me it was a 6.5/10 game.