Crackdown 2

To my knowledge, there's only one game in the world that lets you team up online with three friends playing as super-powered SWAT agents, make a rendezvous by leaping over skyscrapers, pile everyone into (and onto) one car, tear down the street at 100 mph (rendering a road-clogging zombie horde into a messy green spray), then crash that car into a terrorist hideout in an explosion that rips through most of the bad guys inside. That game is Crackdown 2, and for that reason Crackdown 2 is ridiculously fun.

The problem is, four-player co-op is really all the game brings to the table over its predecessor. Doubling the number of Agents capable of teaming up over the previous game was a great move and makes Live play exponentially more entertaining than before. But everything else about Crackdown 2 is a letdown: The best parts are those lifted straight from the first game, while all the new additions are annoying at best, infuriating at worst. Crackdown 2 is ridiculously fun, but it owes that success entirely to the first game.