YES. God damn, I'm like 20 hours into SotFS after finishing a 75-hour DS1 run, and HOLY HELL, DS1 is hands down one of the best-designed games I've ever played. Its level design might be my very favorite in any game (and is only challenged by Bioshock and System Shock 2 on that front). Its lore is only challenged by the aforementioned two, and Soul Sacrifice Delta.
Every nook and corner in DS1 is infused with meaning and emotion. I can't really describe it any other way. It sets up expectations, then it either subverts or exceeds them (or both). It surprises, it depresses, it elates- and does all that practically wordlessly!
The level design is so tight that I could probably mentally replay any area in the game (especially from the first half). The music, from the save screen music (which is grossly underrated!) to iconic boss tracks to the Firelink Shrine soundtrack I simply can NOT get enough of, is also wonderful.
The battle system, while frustrating about a few things at times, is brutal, fair and most importantly, extremely satisfying.