I know it's a port of an older game but IMHO Last of Us PS4 is one of the best games I've ever played. Just awesome, couldn't put it down so I finished it over the course of one weekend and proceeded to reflect on it for the next two weeks on a daily basis. Not much of a PS4 guy but, and I don't say it lightly, but IMHO I got so much out of that game that even if I don't play anything else, the PS4 purchase will still feel worthwhile.
If "best game" should reflect amount of time played, I think "The Golf Club" would be my winner. Even with its many issues, I just can't stop playing it.