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For almost Linux's entire 20-plus year history, people have complained about the open source operating system not having enough games. That was then. This is now.
Today, thanks to Valve's SteamOS, a Debian-based Linux targeted primarily for games and entertainment, we have the first PC operating system that's designed to be both a gaming and workspace operating system.
While most users will only see Steam-based games, worker-bees can also use its GNOME interface for their jobs.
Linux Mint with Cinnamon
Personally, Linux Mint with the Cinnamon desktop is my favorite Linux desktop. Cinnamon takes the best features of the older GNOME 2.x, adds in some goodness from other interfaces, and the result is the best old-school Windows, Icons, Menu, and Pointer (WIMP) desktop out there on any currently shipping operating system.
When people tell me they have to finally move off Windows XP or 7, and they're ready to give Linux a try -- and if they're ready for something new and different, I suggest they try Ubuntu with its Unity interface. But, if they want a desktop that feels a lot like XP's desktop, I'll point them to Mint and Cinnamon every time.