Of the King adaptations I've seen, I've liked:
Carrie (1976, Brian De Palma)
The Shining (1980, Stanley Kubrick)
Christine (1983, John Carpenter)
Misery (1990, Rob Reiner)
The Shawshank Redemption (1994, Frank Darabont)
The Mist (2007, Frank Darabont)
And I have not liked:
Children of the Corn (1984, Fritz Kiersch)
Pet Sematary (1989, Mary Lambert)
It (1990, Tommy Lee Wallace)
It (2017, Andy Muschietti)
It: Chapter Two (2019, Andy Muschietti)
The only King I've ever actually read is The Mist.
I think that It has an interesting core concept, but the various adaptations - and the central story itself - do not at all live up to that concept; I also think that the concept is held back an incredible amount by the fact that the story is just so damn beholden to the idea of Pennywise taking always defaulting to the form of a clown. I haven't read the novel, but I'm going to assume based on the adaptations that the novel also doesn't do justice to the actual ideas at It's core, either. Tim Curry does give a good performance, though, and that's about all I can say that's good about any of the iterations of It.