The BC is still in early fase and possible the games people recommend for X360 will not work (soon) on xone. I recommend sunset overdrive/forza horizon, possible try games like Dead Rising 3 maybe think of getting EA access for a month and see if you like it (10-12 games to play will kill your hunger if any)..
Just post your GT in the republic thread and I or someone else will add you in the preview program so you can play some X360 games already. From the games that work I recommend Kameo. It is cheap but so fun platform game.