We were having problems running multiple devices - constant buffering and poor signal. The Archer C3200 solved all that. We are still running four Internet TV streaming devices (one in a garage conversion outside in the garden) four phones, laptop, smart heating and alarm system off the wifi on our basic sky Internet package with no trouble.
The setup was easy. Even renamed the three separate networks so the kids could easily distinguish between the 2gb and 4gb bands.
Highly recommended for large household with lots of streaming. None of us are big gamers so can't speak for that but I think with a decent broadband speed, this would be capable of anything you throw at it.