I currently own (non Kinect):

Forza 6
Diablo 3 Ultimate Evil Edition
NHL 2016
Destiny with expansions
Peggle
World of Tanks (free)

I think Diablo 3 is a great couch game for 2 players. It's not a split screen - you play on the same screen and it's much like the PC version but they have added a ton of stuff since we played it 3 years ago. Worth the $20

Destiny I bought because of the hype and it was $25 for all the expansions with the game. It's FPS so I am not thrilled about playing it with the controller. I will force myself to finish the main story and maybe try raiding when I get to a high enough level (I think it's 12 player raids)

I think I will try to get a racing wheel that works with Forza but it's definitely playable with the controller if you turn on traction control etc.

Not sure what else I will get maybe some Lego games for the kids and a flying game.