Any decent WiFi network connection will be completely and utterly indistinguishable from a wired connection. I've been using a wireless card in my gaming PC for years, and it's always been fine.
Just to demonstrate: If I open up a Windows command prompt and enter the command "ping -t 192.168.1.1" to test my wireless latency, the response time is consistently <1ms, which is imperceivable. It's basically perfect. Turning off wireless, running a cable downstairs to the router, and running the test again will not yield any better results.
People who claim that WiFi sucks are usually those unfortunate enough to have bad hardware, bad interference/distance between them and the access point, or there's just something about their living conditions that prevents them from having a solid connection. But like I said, if your situation permits for a good WiFi signal, then there are no noticeable disadvantages.
Hope that helps.