Well, that didn't take long. I finished Crackdown (links: GameSpy, GameSpot, GameFly) before I was even able to add it to my "Now Playing" list. Which you think would have me fuming about value or something. But I'm not. I actually had a blast playing Crackdown. I'd recommend you rent it, not buy it, but it's definitely a really fun game that's just different enough from the other games out there to feel fresh.
Crackdown takes place in a big open city where you can wander as you please, much like the Grand Theft Auto serious. But Crackdown has much less of an emphasis on driving. As the game progresses you level up skills that make you increasingly superhuman. The value of driving around is quickly eclipsed by your ability to leap from rooftop to rooftop (or even from ground floor to rooftop). The superhuman agility and strength that you achieve gives the game a little bit of a Matrix-like feel. You can even pick up vehicles and use them as weapons (kinda like Jet Li in The One). A lot of the gameplay actually feel a bit like our very own Science & Industry, with the spawning, superhuman enhancements, and weapon capture elements. Just rebrand the game to include more of a corporate theme (instead of gang warfare) and include more high-tech weapons and you're good to go.
The game revolves around you seeking out and assassinating a series of gang bosses. Which is definitely fun, but unfortunately is the only primary goal of Crackdown. There are car and foot races to do on the side, which are kinda fun but mostly function as achievement point syncs. The core gameplay of Crackdown is great (leaping around never gets old), but it is a bit disappointing that there wasn't more content. Still, it's a great way to spend a weekend.