Honestly I'm happy with my 360 and all the games I have for it I mean I can't even play those games on the Xbox one! And not being able to buy used games?! That's my life trying to get games cheaper or on eBay for less because I'm the kind of person who try's not to pay full price so I'm not very happy about that on the Xbox One.
You can buy used games for Xbox180 now they changed that policy check these links http://www.xpgamesaves.com/topic/76173-xbox-one-confirms-drm-policy-changes-official-statement/ http://www.xpgamesaves.com/topic/76183-details-on-policy-changes-what-you-dont-get-kotaku/