For a while there, it really looked like multiplayer wanted to dominate the world.
Some could argue the online multiplayer explosion had a profoundly negative impact on the quality of single-player campaigns. I don't believe that, personally, but I do know that when a developer has a limited budget, and they obviously spend the majority of it on multiplayer, it's clear to all.
This year, I think we're starting to see a single-player resurgence. We're fresh off the release of one of the most accomplished and satisfying single-player-driven experiences out there; Bloodborne can be played with others but as everyone knows, it's best experienced solo. Interestingly enough, although it was a missed opportunity, I think Visceral Games did put a lot of effort into the Battlefield: Hardline campaign.
And people can whine all they want about The Order: 1886 ; it remains a linear, narrative-driven adventure the likes of which we haven't seen in some time (and due to the critical reception, might not see again). There are more examples coming in 2015; The Witcher 3: Wild Hunt and Batman: Arkham Knight are right around the corner, and those titles will also thrive on single-player entertainment. Toward the end of the year, there are games like Metal Gear Solid V: The Phantom Pain and Final Fantasy XV as well.
I just like to see things finally leveling out, you know?