While I don't like the games as much now (mostly from playing them too much) They have definitely had a great effect on my life and been a great inspiration for what I want to make in the future with my game development. Their difficulty and challenge, world design and exploration, the atmosphere and aesthetics, choice in build variety, interesting lore and story and general combat where you have to more consider what you are doing make for engaging experiences. I just think its gotten a but repetitive, especially with Elden Ring to me not really innovating enough with mechanics, especially with how big the game is.
Dark Souls 1 will be my favorite of the games cus of its inter-connected world, just general nostalgia for being the first of the games I played and the world and enemy combat encounters being the best I would say in the series. Dark Souls 3 will definitely have the best bosses in my opinion and I like the variety in gimmick and more traditional styled bosses. Been doing a broken sword run in Dark Souls 3 and currently doing the DLC. If we count Sekiro tho then that game in my opinion goes beyond everything the other games have done in my opinion.