Wifi has never been problem for me until now.
Before I moved out for college I was on wifi, with a good ass router too.
No major lag problems, ever, no disconnect, shit was as smooth as butter.
I go to college and the flow of the internet is dependent on the game all of a sudden.
It's still smooth, it'll just kick me out of whatever online activity I was doing when it feels like it depending on what i'm playing.
Thankfully Injustice doesn't give me any problems, hopefully MKX runs continues that trend.