First of all, there is nothing wrong with disliking a game or liking it less than other people. I can understand where you're coming from though when you say it can be hard to come to terms with liking something less than others. It's particularly frustrating because it happens so often for me, I really like the Final Fantasy games from a theoretical standpoint and can even say that I enjoyed the final products of the games I've played in the series, but nowhere near close to the extent of most critics and fans who praise them. To me, it feels like I am missing out on classic titles despite having played through the whole affair, and it sucks. Fear of missing out can be quite depressing, especially when you enjoy a lot of a games elements on-paper, but not so much in execution.
The best I can do is say that at least you tried the game, and you gave it a decent shot numerous times, so that's all that can be said. I will say that trying games multiple times shouldn't be seen as a waste of effort - there's been many times where I couldn't get into a game at first, but ended up loving it once I finally did get into it (kind of struggling to think of examples, brainfarting right now, but it's definitely happened). I also haven't played Dark Souls in years and even when the HD remaster came out, I didn't really get back into it despite playing that version for a few hours. So it's possible that I wouldn't like the game much going back to it, hell anything is possible.
What I love about Dark Souls, first and foremost, is how tight everything feels. The world, the combat, the leveling up system, and the decision making processes are amazingly designed and crafted. You can tell that everything in Dark Souls connects into a cohesive whole, and it's that design principle which I think makes the game so captivating. A great example that I wish more games would take queues from is the side quests. In a lot of RPGs, side quests are both obtuse (mostly in older titles) and not really a reflection on the games mechanics. Interacting with the world in most RPGs is incredibly awkward because there's a thick layer separating the game mechanics and how the plotline actually wants you to experience their stories, especially in older JRPGs. Dark Souls, on the other hand, has most of it's decision making processes handled through the same gameplay mechanics you use throughout the entire game, and the results of these subplots directly effect the world through and through. Often whether or not you complete a sidequest one way or another is accomplished by killing an NPC, summoning an ally or enemy NPC in an obscure location, or finding hidden areas ... which are all things you already do throughout the entire game, anyways. Being able to kill an important NPC to change the atmosphere of entire area is one of the most memorable parts of the game for me. What's great too is that a lot of sidequests have somewhat obtuse continuations, but since the entire game is built around secrets and exploring your environment, and since you usually get different rewards at each tier of a sidequest, it is still a wholly satisfying experience even completing one part of a longer chain of events.
I think it's important to note that, for me and probably a lot of people, playing Dark Souls a few years or so after launch when it was first becoming a huge game online (around mid-late 2013 for me, I think it's popularity started to skyrocket around 2012 or so) was like being part of a grander experience. Dark Souls takes a lot of the obtuse nature of older games and makes it into an intended mechanic that actually makes me less frustrated with the game. You know how annoying it is to look things up in older games because you don't know how to progress, only to either A ) feel like a moron because the answer was seemingly obvious or B ) feel completely annoyed because the answer was something you could have never guessed? Well, Dark Souls has the hint system just for that, and better yet even if you do go down the wrong path, the game almost encourages it because there's a lot of great loot and gear you can find in those areas. I wouldn't ever feel bad about looking up anything in a Souls game, because the hint system is already there to show that the game designers understand and even accept the modern reality of the internet guide machine. Or how about the co-op system? To this day most singleplayer-oriented games, hell most multiplayer-capable games in general, can't make a player feel accomplished for completing a task with a random person on their team. I love multiplayer games, but unless the game mechanics are really satisfying, it can be hard for me to get sucked into the moment knowing that I'm just with a bunch of randoms (and this is despite the vast majority of my time with online multiplayer games being solo). Dark Souls is one of the only games that can really make you feel connected to other players just through the sheer sense of pride and accomplishment that comes out of beating a tough boss. The only other game that I think can really compare in this regard is Monster Hunter, despite many games implementing Souls-like mechanics since.
All of these reasons and more are why I'm a bit saddened by the consistent referral to new games in the series over Dark Souls (and I'm sure I'd feel this way about Demon's Souls too ... if I had a chance to play it). I get that games like Bloodborne or Dark Souls 3 are more accessible, and for someone like you who's already tried Dark Souls and didn't like it it would probably be more worth your time either trying later games or just not playing the series in general, but for me I don't think I'll ever fall in love with a Souls game quite as much as Dark Souls. Those later games just focused so much on just combat that they actively forgot a lot of the other appealing aspects of the original. Dark Souls 3 is kind of a return to form in this regard, with a much higher emphasis on RPG elements like the original, but it makes the mistake of retreading every idea ever introduced from Demon's Souls-Bloodborne, so much so that it often feels unoriginal.
Also as previously mentioned, the verticality of Dark Souls map is amazing and the density of it is almost second to none. If I could create the most bullshit subgenre imaginable, then AAA Metroidvania games would probably be the best subgenre ever. Games like Dark Souls, Metroid Prime and REmake remind me why I love video games. It's as simple as that.