I really didn’t enjoy Witcher 3 (though I put in 40 hours trying to) so for me it’s easily MGS 5. I loved how the bonkers story-telling (including the intro that I’m surprised to see so hated here) mixed with more standard combat. I felt like the game was constantly surprising me even when I was sure it was out of new ideas. This happened both in its surreal story-telling as well as its gameplay systems.
For Witcher 3, I found the combat system so infuriating that it definitely negatively affected my impressions of the other parts of the game. But I also found the quest to feel formulaic after the first 10 hours (They had their own formula that felt pretty new, but they stuck to that formula too closely in each of the quests). Mostly I think that game just had too much content and largely overstayed my interest in it.