Can we get to the end of this gen before answering the question? What if we take out PS4's first party games from 2018-2020? No GoW, no Spider-Man, no Tsushima, no Last of Us 2, no Days Gone, no Death Stranding...how does the PS4 look then? Not very good.
Why would we count the second half of a gen for a company that is known for their second half strength when we can start judging 3 years before the next playstation?
If you're comparing PlayStation to PlayStation every Xbox game is new to you so why wouldn't Gears & Forza count for PS5 vs the past generation of PlayStation?
Metal Gear Solid 1 > Metal Gear Solid 4
To me PS1 is the best we saw the birth of legendary games like Resident Evil, Silent Hill, Tomb Raider (when it was great), and many more.