Big hardware problems aside, Microsoft's Xbox 360 had the best line-up of games last year with Bioshock, Halo 3, Mass Effect and much more. But that was last year. 2008 will be critical for the Xbox 360 as many are projecting the console to finish behind the Nintendo Wii and Playstation 3 in terms of worldwide hardware sales. Fortunately for Microsoft, their spring line-up is as strong as their competitors. Here are the top five Xbox 360 games of the spring.