Gaming overall is better than it has ever been and I'm from the NES era.
I regularly come across people who want to brow beat this gen claiming it lacks this that and the other. SOME critiques might be true to an extent, but I find most times people have just grown out of gaming and will do everything possible to avoid admitting it for whatever reason.
To answer the OP, I'd like to see a higher attention to detail.
(I don't need a game to be 4K 120fps. 4K 60fps should be standard and I don't care about ray-tracing.)
That being said, within 4K 60fps minimum parameters, I'd love more than anything to see more destructive environments. Every bullet should leave a hole, dent, etc on every object.
Every wall should be destructible. We should see shell casing on the ground. Cars should show various degrees of damage. I basically want the games we have right now, but with that type of detail. I want devs to stop chasing ray tracing and arbitrary fps numbers and focus on details.
Where are the games today doing details like this:
This is the type of stuff I want to be standard in every game.
I would think at least Sony with their SSD that was praised for it's potential to pull data at lightening speed to give us the ability to see and hear [a million] pebbles would be able to handle the type of things I'm mentioning so I'm not looking for anything necessarily from the technology side; moreso from the dev side taking the time to implement this.