You should have already read CVG's final verdict on Grand Theft Auto IV, so here's a compilation of what some of the magazines are saying.
Xbox 360 - The Official Xbox Magazine: "It says something that even at the end of a three-day session, with every island and a substantial chunk of the sidequests unlocked, I was still ploughing on because I wanted to see how the story ended.
And I was still finding new stuff: the way a police klaxon goes strangled and gargley if you dent the light bar, the pedestrian who had the original GTA theme as their phone ringtone, the way that headshot drivers can fall on the horn and accelerator so you're run over by a dead man... This sets the standard for what you should expect from a truly next-gen game. You owe it to yourself to play it." 10/10
PSW: "As shamelessly whorish as it sounds, GTA IV is quite possibly the most breathtaking game of the last decade. It outdoes its predecessors in every sense of the word, while at the same time not forgetting its roots, you the fan, and what makes GTA games such an insanely funny and euphoric experience in the first place." 10/10
PlayStation Official Magazine: "GTA IV is richer, deeper and more involving than its predecessors. By the time the story threads start to tie up, the mission trees finally shaken out, you're totally invested in the characters and their world. I'm actually jealous of everybody about to experience it for the first time. The greatest testament to GTA IV's brilliance is that I haven't been able to stop thinking about it since putting the pad down." 10/10
Xbox World 360: "It's particularly hard to score GTA IV - and trust us, we've debated long and hard into the night over those vital final few percent. As a game, it certainly contains its fair share of flaws; yet as an experience it's truly unparalleled, impossibly ahead of its contemporaries in nearly every single department. For that reason, we've decided to bestow our highest ever rating on GTA IV. Put simply, there's no more deserving candidate." 98%
Game Informer: "I now know how film critics felt after screening The Godfather. It's been days since Grand Theft Auto IV's credits rolled, yet I can't seem to construct a coherent thought without my mind wandering off into a daydream about the game. I just want to drop everything in my life so I can play it again. Experience it again. Live it again...Grand Theft Auto IV doesn't just raise the bar for the storied franchise; it completely changes the landscape of gaming." 10/10
Gamepro: "Considering the fact that it's been a target of political and media pundits who keep harping on the infamous Hot Coffee incident, it's understandable to think that Rockstar might tone down the adult themes in GTA IV. But thankfully, that didn't happen. This is a mature game, and a devilishly good one at that." 10/10
GameDaily: "Grand Theft Auto IV lives up to its grand expectations by weaving a Hollywood-ready American Dream plotline with a finely-tuned game experience -- taking the tried-and-true GTA formula and plugging it into a living, breathing version of Liberty City." 10/10