Most people I know who hated the original GTA games (I said most people) never actually played it. That is to say, they got in, drove around the sandbox, ran over some pedestrians, shot some cops, etc. Sure it was novel, but it wore thin. Just hype.
Most people who actually play the game to a significant degree, i.e., start the story line, play a few missions, cannot help but be sucked in and realize what an amazing series it is.
Anyway, that's not what I came here to say. I was just going to point out that gamerankings.com currently has it listed as the best reviewed game of all time. It beat out Ocarina of Time. Now, this is the first day of release, so more reviews are bound to come in and could potentially pull it down, but that's a helluva milestone. I really can't wait to play this game. It's almost a blessing that I don't have a PS3 or 360 right now cos it's law school finals time, and trust me, very few of you have ever in your lives taken exams if you haven't taken law school exams. They're the most horrible things ever. And GTA IV would probably be doing its best to flunk me out of school if playing it were actually an option right now.