2014 taught me to wait but, like most, I learned the hard way. I made the mistakes - arguably minor blunders - of preordering Destiny then Evolve, both of which were lacking in content and relied on grind-based achievements for replayability. Luckily, both games were somewhat decent mechanically and production-wise, however I don't revisit them as much as I'd convinced myself I would.
There's such a vast catalog of excellent discounted games out there that I'm attempting to discover firsthand this year. "Last years' best" and the like should do well to tide me over til that Witcher 3, No Man's Sky, Bloodborne anticipation wares off and the reviews come out.