That's a though question. There are a lot of good games coming in 2014:
Alien: Isolation
Castlevania: Lords of Shadow 2
The Crew
Dark Souls 2
Destiny
Diablo 3 on PS4
The Division
The Evil Within
Evolve
Infamous: Second Son
Mad Max
Murdered: Soul Suspect
The Order: 1886
South Park: The Stick of Truth
Thief
The Witcher 3: Wild Hunt
Apart from Destiny my top three are
1. The Witcher 3
2. Thief
3. Dark Souls 2
4. Evolve
5. The Evil Within
6. Diablo 3
7. Castlevania: LoS 2
damn... I'm afraid I can't narrow it down to three games.