Linux kernel is superior at low level functions like read/write, ram management and other operations necessary for the Server world. Because of this according to Phoronix some ported and wine games outperform their Windows counterparts already (eg: Gallium Nine games).
Of course it's not a landslide victory or snowball victory just yet but it's entirely possible that Linux will have superior backwards compatibility as it already has in games like StarCraft original.
For most pc gamers the experience is somewhere between good enough and great. A worthwhile tradeoff for the performance benefit of not needing anti-virus software, a more secure system, and freedom including the right to your digital privacy. In some cases a simple problem like having your photo library encrypted due to virus is reason enough already to ditch windows, depending on what kind of content a person stores on their computer.