Ni No Kuni, AC4, Hyperdimension Neptunia Victory, and Pokemon Y are the only 2013 games I've got (so far). I've enjoyed what I've played of them all immensely. If a ranking system is needed it'd be.

1: Assassin's Creed 4
2. Pokemon Y
3. Ni No Kuni
4. Hyperdimension Neptunia Victory (Only because I haven't actually played it yet, it could be higher).