Personally I can't get into franchises when I don't start from the first games so I would love to see the OG god of war on Steam, hell wouldn't mind infamous too.
Really the first one on PS4 feels like a total new series compared to the first 3 games. Not saying the original 3 aren't worth playing, but they aren't all that necessary to this story.
I played God of War (2018) a few months ago without any more context than what is known about Kratos in the public eye. The 2018 remake does not tell you what Kratos did, but it shows you how it affects him. Flawlessly. This game nails the “show don’t tell” approach like so few do. If you like narrative driven games, or want a good modern story about a man trying to be a good father, or like well-designed action games, or like norse mythology, this game fucking rocks.
As others have said, you don't need to play the old ones, and I doubt Sony will bring them to PC, so your best bet is probably emulation if you really wanna play them.
I really liked the two most recent ones, though I only played a tiny bit of ragnarok at a friends place because im not about to buy a playstation. I tried the original after on emu and its just not my thing. new ones are more talky and just listening to mimir while going around which is the most important part. theres a huge gap between the old games and the newer two with a whole lot left unexplained and you fill in some of the blanks from the ingame dialogue.
if I had one major gripe, its the chapter where the kid has his rebellious phase or something and I recommend not backtracking for side goals untitl he becomes mentally stable again because the dialogue makes him seem really bipolar if you backtrack while he is being pissy. or just don't miss anything as you go.
edit: I meant to say something about how if you dont play the og games you kinda get the kids point of view where he doesnt really know anything about his dad's past. that and the beard saves the guy from looking like warpaint agent 47.