Voltaris on 12 December 2014
I guess its primarily due to the fact that The US is by far the biggest market and really where things get done. Decisions made by third parties be it exclusives or marketing rights are swayed by the larger markets. In places like europe where consoles are mainly bought for annual releases like fifa, the US has a wider range of annual releases for the masses ( COD, AC, Madden, NBA 2k, NFL) and just greater attach rates generally than other regions
