Most people who use Linux for desktop use are well aware of the one of the largest issues facing the platform: Lack of commercial software. Now in most cases this is not an issue, no MS Office - use OpenOffice, no Internet Explorer - use FireFox. However one thing which there is currently no replacement for is gaming. Try as they might there are just not enough Open-Source game developers (or even closed-sourced ones) that bring the level of gaming quality, as of yet, to Linux that Windows enjoys.