A few thoughts on It...
The source matter is, and always was, the cheese supreme. The prologue/pre-teen portion of the story, which this movie focuses on exclusively, is particularly corny.
The movie embraces this cheesiness and delivers a faithful adaption...essentially a very, very hard R version of Scooby-Doo with f-bombs and dick jokes galore.
Well-paced and almost perfectly cast, it's never slow or boring even though it was a full 2+ hours...and that's considerable praise from a well known hater like myself.
Pennywise was more than adequate and beefed up quite a bit by high quality CGI. Nobody was ever gonna top Tim Curry anyway...so they didn't try. Good decision.
Highly entertaining and recommended. About 1000 times better than that Alien:Covenant trash. But not near the level of excellence of something like The Witch. I look forward to part 2.