Hyped on that GTA IV?

Been hearing a lot of good things about Grand Theft Auto IV, but I’m still not sure if I should get the game. Let’s see, I’ve heard a whole bunch about the action packed single player, but I heard it to be real boring the first three hours. Then there’s multiplayer (don’t know how that’s possible) that’s suppose to be real banging. Sex, violence, mini-games, jacking cars, is it really worth the $60 dollar investment? I just want to make sure this game lives up to its hype and not let my Call of Duty 4 override it. What’s your review?