If something can be accurately measured it's a fact. It's a fact that the game is nowhere near as polished as DS3 (older engine, terrible frame drops, less fluid combat, terrible later half of game due to cut development time). Clunkier (4-directional roll, inability to sprint while locked on). Much more limited boss/enemy movesets (most of the beginning bosses have like 3 attacks). There are more bosses that are meh or straight up bad (Asylum Demon, Taurus Demon, Capra Demon, Gaping Dragon, Ceaseless Discharge, Centipede, Butterfly, ***Bed of Chaos*** ((worst boss in the whole franchise)), Gwyndolin). Soundtrack I honestly don't even remember other than Firelink and Gwyn, lmao. Completely incomparable to DS3's masterpieces. And PvP? There's not a single person with a brain that wouldn't admit DS1 had THE WORST PvP of them all.
Due to all of this, DS1 being the best is... just no.