Graphics: 5/5 At first glance, the game looks pretty unimpressive, but quickly, the game grows on you and you'll appreciate it much more. The character models are good, the body movements are fantastic, the Ragdoll Body physics are great, the city is fantastic, there is little framerate drop even in online play, and the game looks absolutely stunning from a helicopter when you fly over the city. Grand Theft Auto IV may not look like the best 360 game straight up, but when you consider how much is put into this game, it really does look good.
Sound: 5/5 Easy 5/5, and one of the best sounding games ever. Radio stations and TV stations and characters with great dialogue for the most part. The game sounds great, of course. I can't think of one sound flaw in this game. The voiceovers don't impress everyone, but I think they are done quite well.
Control: 4.75/5 Very confusing when you first boot up the game, but quite easy to get down after a little while of playing. Many people have the car's new "realistic" controls. I actually like it better because, well, it's more realistic. It is frustrating at times, but it's not hard to get used to. The helicopters on the other hand, that's another story. They control well unless you're going fast - good luck landing one of those things. The new cover system and fighting system are pretty good, but not great. The cover system is actully somewhat useless, especially in online play, since players know where you are, and the fighting system is also flawed online because sometimes, although seldomly, headshots don't register.
Fun: 5/5 Are you surprised by the score? Of course not. The critics really gave this game what it deserves. GTAIV is definitely one of the best games of all-time. Sim-like gameplay, plus a great story, plus phenomenal multiplayer equals one great game. Although the game seems, and almost is, perfect, there are of course flaws. One thing for instance is the lack of being able to play co-op, which is a real downer. Still, the several different game modes will keep you occupied for months - or even years to come. If you are trying to find a reason to dislike this game, good luck, because just about anywhere you look, you will find greatness.