Interestingly lots of games have already been mentioned that I love to replay as well.
Metal Gear Solid franchise. Since most of them are properly intereconnected the entire story throughout Metal Gear is just amazing. Okay it has been a few years since I replayed it entirely, but that is mostly due to me not owning a PS3 and the last time I replayed them was with a mate on their console. MGS Legacy Collection.
Resident Evil 1,2,3,Code Veronica, Remake, 2 Remake, 3 Remake. I am sucker for the old tank and fixed camera angle games and I also love Chris, Leon and especially Jill Valentine. I replayed RE3 countless times changing the gun powders and trying different ways to finish the game. Whether it is knife only, handgun only or full blast. Absolutely love the RE franchise for replay value. Soon RE4 Remake and I know I am going to replay this a lot
FROM Software games. I don't think this needs any explanation. Most of us probably have replayed FROM games. I don't keep count, but I probably played Dark Souls 1 and Dark Souls 3 the most, but I will replay Elden Ring in the future again. Great games, great replay value with different builds and ways to tackle combat.
Final Fantasy games. For me it is the journey of Final Fantasy games. It seems like the best and biggest adventure to start a game in Balamb Garden and eventually find yourself crossing the continent, the entire world and even more. I don't frequently replay those games since they are huge. I think 2 years ago I replayed FF9 and still love it. Excited to see what they are doing with FF16.
The Last Of Us 1+2. I just realized that TLOU is the first non japanese game in my list. The story, voice acting and emotional journey of those games are so powerful that even after replaying them multiple times they still have an impact on you. Hoping that the Remake is worthy and I want to see how TLOU1 works with better controls/gameplay.
I really believe that Sony and Xbox need to invest in digital accessibility and preservation of games. Xbox has done a fantastic job so far with it and their BC made PlayStation realize they need to do something similar. I hope that eventually we have most of the games available in digital form to download/purchase. I am not asking for free games, but if I could play the entire MGS Series or old PS1 Resident Evil games on PS5 by downloading them digitally from the store that would be awesome.
It looks like they are going that way and I hope they soon add them.