Well, I haven't posted here for about 6 months, if I am right so I thought on saying here something.
Well, now I got GTA 4 about 2 weeks ago and it took me some time to complete it, all the missions. Then I started to "party" with Niko's friends in-game. From my opinion the game isn't overrated, it deserves the rate that it had been given to. I see that mostly, people here are comparing it to SA and that is totally bullshit. SA was created in 2004-2005, if I am right and IV was created in 2007. When SA appeared it was a big hit, yes, but everything changed after IV appeared. How other guys said, a new era began in GTA games. Even if they have the same name, the GTA part, SA and IV are different games, if I can say like this.
Sword of Leon said all the things very good and clarified them very well.
So, as a conclusion, IV hasn't been overrated.