In 2013 we had:
Killer Instinct, Forza 5, Dead Rising 3, Max: The Curse of the Brotherhood, Assassins Creed 4, Xbox Fitness, Call of Duty Ghosts, Madden, Fifa, other smaller titles, Indies etc.
This year we have:
Titanfall, Plants vs Zombies, Watchdogs, Madden, Fifa, Destiny, Sunset Overdrive, Halo:The Masterchief Collection, Forza Horizons 2, Project Spark, Assassins Creed Unity, GTA5, Kinect Sports Rivals, Dance Evolution, more sports titles, other smaller titles, far more Indies etc.
Edit: I forgot Mincraft, Tomb Raider, UFC, Diablo 3. All great games
Edit: Exclusive demos!
What we know is coming next year:
Quantum Break, Batman, Evolve, Halo 5, Fable Legends, Crackdown, yearly titles.
Edit: I forgot The Witcher 3 (how could I?)
Edit 2: Rise of the Tomb Raider!
Still waiting for Gears of War 4 or a Gears Collection hopefully next year!
Xbox One has so many exclusive titles and things are looking great for the system. Xbox One is beasting homies