From the preview: "As is the norm with pre-release builds, the gameplay wasn't perfect, so this won't be an extensive review, but even with these glitches and flaws, I came away with a clear opinion that Crackdown raises the bar for "open-world" or "sandbox" action/adventure games to follow. It's not a genre-defining game, as Grand Theft Auto III was, but it does take the premise and moves it forward with a bunch of nice, new features.
Crackdown offers a tried-and-true premise as its foundation: You're a scientifically enhanced crimefighter who's let loose to clean up Pacific City of its gangs by nearly any means possible. You have your normal cache of weaponry, from handguns to shotguns to high-power rifles to a rocket-powered grenade launcher. As the gangs get more challenging to beat, you'll also be adding new gear with which to suppress this urban warfare."