The Witcher. The first one. I love that game, it's my favorite in the series. I love being able to switch combat stances, manually switching between silver and steel, the medallion mechanics, and its music and atmosphere are incredible. I use mods to make Witcher 2 & 3 Geralt closer resemble his original appearance.
Assassin's Creed Unity was fairly maligned for its awful release. Have people seen it since? I don't know if it's more popular now. It's a lot more polished than even most of the acclaimed ACs, and because of its launch, Ubisoft never released thirty $3 DLC packs. Instead it has one expansion, and it was given to all players for free (also there's some pre-order weapon pack, who cares).
Vampyr kicks ass. I have to go. I don't have time to talk about Vampyr. I really liked Vampyr. I wanna see Don't Nod make more action RPGs (they changed their name, it has a space and apostrophe now).