I'm going to be a tool and not pick anything, and instead create my own category.
"The Little Things"
These are the things that are just really cool in some games. Like in Uncharted and The Last of Us, how Joel/Nathan will put their hand against a wall as they brush past it. How in some games, tall grass will move out of the way as you move through it. In Hitman: Absolution, the lighting is determined not just by the light source itself, but by the walls and objects around you. In The Walking Dead, you have a limited time to respond, making conversations feel more natural.
I want to see more little things. I want to see stairways treated as individual stairs, not just ramps than don't look like ramps. The only game that comes to mind that has truly made that work is Heavy Rain. The Last of Us and Ni No Kuni have come close with stair-climbing/descending animations, but they still move down the stairs like they're ramps.
Many games have come a long way in making solid objects really solid, but I still see object clipping in a looooot of games. In other words, collision detection could use a lot more polish.
Okay, okay, enough of that. I'll pick one.
If I had to, I think I'd pick a focus on AI. Companion AI, in my opinion, is still lackluster. Like everything else, it's come a long way, but I still see my teammates pulling some pretty derpy moves.
I love Ni No Kuni. It's one of the best JRPGs I've played in over a decade. But I swear, my party-members are dumber than a flippin' sack of hammers who can't do a damn thing for themselves.
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