Just finished with all bosses. I think it took less than 20 hours?
This is a pretty good remaster. Graphics are sharp and the framerate is smooth. The Blighttown experience aside, it didn't really do much to change my opinion, though. I think Dark Souls is ultimately a great game. I think it's also brutally uneven and even a bit sluggish when compared to Demon's, BB and Dark 3.
Everyone knows the first half is pretty gud. Undead Asylum is the best dedicated tutorial area in the series, Undead Burg/Parish is solid (though still far behind Central Yharnam/1-1/High Wall imo), and Depths/Blighttown/Sens are all great, along with the first half of Anor Londo before you get into the cathedral. After that...ehhhhhh. Okay, Painted World is definitely a highlight - it's an absurdly dense, self contained experience with clever design and killer atmosphere. I wish I felt the same way about the other areas, though. Duke's Archives is shockingly a lot shorter than I remembered, and outside of the two rotating staircases it's essentially just a couple big rooms with not a whole lot happening. Demon Ruins/Lost Izalith are dreck, and I had quite the awful experience with Tomb of the Giants since it took forever to get a skull lantern drop from the Catacombs necromancers (not that Tomb's level design is particularly impressive on its own merits). Speaking of Catacombs, that's a neat little area. I don't love it, but it's aight...same with New Londo, though visibility could stand to be cranked up just a bit in there.
DLC was ok. Royal Wood is super duper meh imo. Oolacile Township is one of the game's better areas from a level design standpoint, but my god is it fucking ugly. At least the bosses are really consistent with the big three there. Not my favorite boss fights in the series when considering how FROM's boss design has evolved, but for Dark Souls 1 fights they're pretty good.
The sluggishness of the gameplay got me good. I didn't remember that the sprint speed in this game is so goddamn slow, which is especially problematic since DS1 has the most backtracking by far, and it can make re-traversing areas and boss runbacks a Goddamn Slog™. Attacks are also a bit slower than in most of the series - even Demon's. Attack startup and recovery feel just a few frames too long in most cases. I eventually adjusted, but definitely don't prefer DS1's combat to the razor sharpness of BB/DS3 or the more arcadey feel of Demon's.
Where Dark Souls excels is demanding a higher level of thinking from the player. Thanks to the interconnected world, it's never just what you're doing in the now, but where you went previously, where you're going, and the other goals you want to accomplish at some point. Some of the other games capture a bit of this when they open up in the late game (BB/DS3), but never to the same extent as DS1. In DS1, the player always has to consider their mental list of tasks and how navigation can connect them together. It's neat, and I wish that style of world would come back with a better suite of levels. Or maybe an interconnected world is just at odds with making each individual area a knockout, and that's why they haven't attempted it again. The world may never know.
BB > DS3 > Demon's > DS1 > DS2