It depends what kind of gaming you do. In general, I'd say no. Ethernet shouldn't be needed either since your bandwidth is likely far below the wi-fi's capabilities.http://www.anandtech.com/show/4590/bigfoots-killern-1102-wireless-networking-vs-the-world/10
This sums it up for me though:
"My biggest concern is that, as good as the Killer Wireless-N is, many users will likely never notice. "