OK, so my assumption was correct:
Ori & The Blind Forest
Forza Horizon 3 (if we're only counting one Forza game)
Halo 5: Guardians
Gears of War 4
Dead Rising 3
Halo Wars 2
Halo: Master Chief Collection
List like these are useless, really. Even if it can be agreed that a game is objectively well made quality-wise, people still have subjective tastes when it comes to games.
Take me for instance. Out of that list, only Ori & The Blind Forest is a game that I would buy. Maybe. If there wasn't anything else to play, and that's a rare occasion for me with the PS4 library. Same goes for Nintendo when it comes to my personal tastes. Many games with good quality, but nothing that I would ever buy.