Bios - Just like 360, the ability to share where you are from and write some info on your profile.
Fix recent players as not all games show players you have played online against.
Longer DVR vids and the ability to like/dislike and comment on each video because at the moment uploads are just boring.
Screenshot capture - other consoles allow this so why can't you upload a high res screenshot with the above abilities included.
Make auto sign in for people like me that dislike Kinect. Without it you are limited to a slow startup and have to manual sign in everytime.
More options for resolution and HDMI colour settings.
Improve voice chat because I can't hear people most of the time, just snippets of what they are saying. When it works the quality is good though.
Ability to send voice messages too.
there are more but I thought these are most important to me, silly that most of these things worked fine on 360 and for some reason totally removed on Xbone.