There's plenty said already about this series' negative and positive aspects so rather than repeating them for the sake of sharing my own views, I'll simply add that there's barely enough story to cover 6 episodes, let alone 10.
There's large sections of unnecessary dialogue and the pacing is just far too slow. It would be fine if there was enough plot going on but there isn't. I think it was a big mistake to make this story 10 episodes. It really feels as though there was a management decision to make it a 10 parter when there simply wasn't enough story there.
Episode 7 for example contained 20 minutes of completely unnecessary dialogue before anything actually occurred. The rest of the episode was good. It was a chore to sit through at times. It does make one un-invest in the story and characters. Just get on with it. It's all building to a rather predictable confrontation and yet we must wait so long for it.
Personally, I felt that the first two episodes were the best when we didn't quite know what was going on. Once the reality of the story is uncovered it lost much of its intrigue as this has been done many times before, going back to King's original Salem's Lot.
Well made but is visually consistently gloomy to the point of being silly.
Adrien Brody's confident but one note performance was not enough to hinge the series on. There's really no other characters of note to care for unfortunately.
Worth watching and might feel fresh if you haven't seen a lot of films of this type before but its certainly nothing new.
Midnight Mass, which was released at approximately the same time and covered some similar ground and is also slow and wordy in parts, is far more interesting, with less episodes and is better made. Recommend that one over this.
Failing that, check out some classics like Near Dark, Interview with the Vampire, Dracula from 1992 or even Fright Night from the mid 80s, which is a lot of fun. No need to watch 10 episodes when you can watch several films and be hugely entertained.
At least they didn't freaking sparkle.