Imagine a show with a tense, dark atmosphere, an interesting setup, beautiful combat animation, and vast, vast potential. That's what Demon Slayer
was, before the ruinous introduction of the comic relief characters.
As soon as you see Zenitsu for the very first time, Demon Slayer completely abandons the serious atmosphere it had built up in favor of stupid, unfunny "comedy". Haha Zenitsu is a pathetic pervert. Oh so funny in my show about decapitating demons that killed the main character's entire family. Haha, I really needed that.
Things aren't helped any further when Boar Head guy is introduced. I finished the show, I finished the movie, and I can say confidently that this show is no longer interesting in the slightest.
As other commentors have mentioned, the animation is fantastic, and beautiful. That doesn't change. But the investment you have in the potentially interesting story? That doesn't.
My recommendation to you is this: as soon as you see Zenitsu, stop watching. You've experienced the best the show has to offer already.