I m not going to give u evidence because I dont have any.
BUT
Yes, I believe that review website are supporting GTA4 partially because it is more mature games that completely correspond to what they want to play (website are ran by 25-40 years old male gamers).
Since, GTA4 is not on Wii AND since Wii is getting a lot of hype with casual products (Wiifit), hardcore mature gamers are pushing GTA4.
Overall, I dont care of gameranking since, for me, SMG doesn't deserve the top1 place (dont care of Mario, no story)
Time to Work !







