You ever had that moment where you're playing Call of Duty and someone is hogging the WiFi due to their obsession of cat videos on YouTube? We all know the feeling, just want to go round there shoot them.
If you have a rooted Android device, an app which will help you greatly is WifiKill. The app enables you to evict anyone from your WiFi network. You can kill individual connections or kill many at once. Devices stay connected to the network but they're unable to use the internet.
The app works great for me, let me know if it works for you too.
I can now continue playing Black Ops with all the bandwidth I need.