I have a couple of Xbox360s that still see some use. Last time we purchased a console, the kids pushed for a PS4 due to some of the games on there that aren't available on the Xbox One.
Someone recently mentioned Gears of War... I spent a lot of time beating that thing on Insane... Might pull GoW out again and see how I do. Not sure I could still beat it on that mode. That's been a few years and my reflexes aren't quite what they used to be
