I can't say it was very scary. The word I would use to sum up the movie would probably be "intense". It keeps your nerves frayed throughout the entire running time, and it never stops being exciting and engaging, but despite some random disturbing visuals it was never all that scary. I've never really seen anything like it before tbh - it's officially a horror, but unofficially-yet-still-officially a coming-of-age adventure story, yet the mood and pacing is more like a thriller (in that it's not scary, but it's always tense). Yes, there was some neat/creepy moments, but if you have a bunch of creepy moments tonally taken in isolation, that doesn't make a scary movie (or even a creepy one). The movie didn't really have a consistent underlying atmosphere of dread or brooding fear which I feel is essential for a horror movie.
Also many of the moments were really not that creepy. I've seen disturbing visuals done far better and more creatively a zillion times in other movies. Not to mention there were a lot of genuinely scary moments in the book that they didn't bother to use. The leper disguise and the bathroom scene in particular were pretty lame.
(Warning: hereafter be spoilers)
In addition, I was particularly disappointed with Henry Bowers and his gang. I realize now I may be asking too much, but in the book Henry Bowers was genuinely psychotic and disturbed. His character honestly disturbed me a lot as a kid. In the movie he's essentially just a hyper-aggressive, somewhat unstable punk. He didn't have nearly as much presence there as he did in the book, nor was he one-tenth as legitimately frightening or threatening as his book counterpart. In the book he really contributed to its disturbing undertones just as much as Pennywise himself did, and in the movie he was essentially neutered. There's no sign of the genuine mental instability, the inhumanity, which made him so threatening and chilling. So that was disappointing.
I was also pretty goddamn pissed off that they decided to make Pennywise kidnap Beverly and turn her into a damsel in distress. What the fuck was that shit about? In the book they all decide to go into the sewer together, as equals. It's honestly sort of beautiful and it's the whole goddamn emotional point of their story. Having them go in to rescue Beverly fucking ruins that. OBVIOUSLY. Also, Mike had a fairly large role in the book and here he has about ten lines and no personality at all. So they turn the only girl into a damsel in distress and they essentially erase the only black person. Way to go.
The climax was also fucking dumb. I thought the "we all float down here" thing was supposed to be a cryptic euphemism, but apparently it's completely literal. Well, that makes it a bit less scary, doesn't it. Also it's kind of stupid that the climax took place in basically a giant well-lit amphitheater, when part of the reason sewers are scary is that they're tight and pitch-black and claustrophobic. Duh. The climax itself was basically just a CGI boss fight. And I'm not even going to comment on all the nonsense with Beverly.
Other than all that, though, I liked it.
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