Well, I have watched the entire series. Hate to say this, but I did not like it. Just didn't grab me. I think most others here liked it, which is good to hear.
I originally thought the series was going to be a straight anthology (this was during the early reporting about the show), but eventually realized it was going to be a traditional episodic. Fair enough. But I thought it might be like The X Files and have standalone episodes. It did not. I think that might have been the better way to go, but I have to say, I have never seen the show Haven, but I think that series may have followed such format? If so, then perhaps Abrams did not want to appear to be copying that product. I would have loved to experience an episode with It visiting the Rock, or maybe a gypsy caravan drive in and put a curse on someone, making them fatter instead of thinner. Oh well...
The show did nail one thing, though...the writers did a great impression of King's voice. The dialogue made me think I was listening to an audio book. Seriously, they nailed his voice. (Just one quick example, going on memory: Remember the scene where Deaver says something to that prison-guard kid like he has to speak up and identify the corruption, and he replies something like do you see the diapers in the back of my car? That's exactly how King would have had a character respond: with a clever, unusual response that is both witty and sad.) Maybe that's the problem...this truly seemed like a novel (or, probably novella would be more apt) for television, and for some reason, that might have made it so ponderously dull. I remember thinking the same thing years ago about Golden Years...there's a great book there, but not a great series. I think, too, King described that as a novel for television, but I could be wrong on that.
And the whole multiple universe-Schism/Dark Tower-like thing...yeah, I get it. But I'm over it. Reducing the Rock's supernatural tendencies to theoretical physics is both pretentious and gratuitous....take a cue from the Twilight Zone of which Abrams is a fan and used as an influence: err on the side of Lovecraft, and leave the Howling Man (did you catch that in the series? One of my favorite Zones) as a Howling Man, don't turn it into a collection of subatomic particles! (Besides, Carpenter already did that in Prince of Darkness, in a much more satisfying manner.)
I would love for the next season to be a straight anthology, but I'm fairly certain it won't be. I will probably watch it, but I have to be honest....I had to fast-forward through some of this past season. Just don't have the time any longer to watch everything as thoroughly as it deserves. One note: my favorite part of the series is when Deaver is in the forest and gets shut into that space in the van (I think it was a van; maybe an RV?). That was legitimately scary, and I think he started getting visions that were off-aspect; one was of a girl, I think, that for some reason scared me like a jump-scare. It was not a jump scare technically, but functionally, to me, it was; just absolutely creepy...
One note (2): Can any name be more King-like than Henry Deaver? I think not, and bravo for that...