Before I come up with the next batch of hints, I suppose I'll say something about the first two games on my list.
#50
Batman: Arkham City (PS3)
YoY: -6
Out of the three Rocksteady-developed Batman games this one is my favourite. It took the template set in Arkham Asylum and polished the existing mechanics while adding a number of great new elements. The sandbox is larger, but not to the extent that it becomes overwhelming, the boss battles were vastly improved, the traversal around the world is a lot of fun, and the gameplay is overall more varied than before. It also doesn't suffer from the issues that took Arkham Knight down a few pegs, such as the over-reliance on the batmobile in the last game of the trilogy.
#49
God of War 2018 (PS4)
YoY: NEW
The God of War-series had never really clicked with me during its original run on the PS2 and PS3. I liked the first game, when the concept was fresh and Kratos actually felt like an interesting and unique character that wasn't yet completely defined by the fact that he was angry and violent. The biggest hurdle that the new God of War had to clear in my mind was somehow making Kratos an interesting and actually relatable character, because without that I found it very difficult to get excited for it. Somehow, they managed to do exactly that, in large part by introducing a number of new characters and having Kratos develop a relationship with said characters over the course of the game. It was a genuine masterstroke, and made for a wonderful story. The gameplay was also a lot of fun, and using the weapons was always interesting regardless of how much fighting you did.
The sequel is, despite the rather silly complaints of some weird people on the Internet, shaping up nicely as well it seems.