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

[pizzahut451]

Metallicube said:

I think it's pretty obvious that reviewers get paid off to jack up the score. Reviews really mean a lot from many gamers, and publishers know this so they expoit it. 

GTA4, while a fun game, is definitely not a 10. It's a 9 at best. It had plenty of flaws in the game, awkward controls, and had pretty bad replay value.

so can we say the same about Mario Galaxy 2? Or any other high rated game??? Because a good selling game and good reviews  means reviewers got paid???? Is it hard to believe that some game is ACTUALLY GOOD?