This sums up a big issue I had with the film as well. Georgie's interaction with Pennywise is lengthy very tense, building up to the end. I loved the whole beginning, but all of a sudden a CG Pennywise shows up taking me out of it for a second. Even the next shot of Georgie crawling away looked very bad, it really stood out among some other great cinematography. Sure I was uncomfortable watching it, but only because it was a very young child being attacked. Had it been someone the Losers' age or older, I really would't have cared what was going on.
The CG really took me out of the film towards the beginning. Almost all the monsters the kids saw could've easily been real. Not only that, any time Pennywise did show up, you'd see him for 2 seconds and then the scene would end. It came across as like the director trying to remind you that Pennywise is still the villain. I think out of all the individual moments where the kids are being scared, Eddie's was the best because he actually interacted with Pennywise and it seemed like Pennywise actually wanted to lure him into the house. Everyone else he kind of chased away for a couple of seconds and then disapeared.
I find everything after they go into the house more interesting and scary because here they are finally interacting with the thing that is trying to scare them. It also makes Pennywise a character as you can tell he's getting more and more frustrated that they don't believe in him,[BLACKOUT]"I'm not real enough for you Billy? I was real enough for Georgie!"[/BLACKOUT]. Only thing is you don't really care because he hasn't really been interacting with any of the kids beforehand. Of course Georgie thought you were real, you talked to him for 2 minutes.
Bill really shines when he gets to talk to them. His scene with Bev in the sewers is great because we can see his performance. Him with the kids in the kitchen of the house is scary because he's doing stuff that is truly scary for them. Just wish there was more of this in the first half. I felt the movie never lingered on any really scary moments, they seemed more thrilling than anything.