I just got one episode left, I'll watch it tomorrow.
Spoiler:
It actually annoys me how we spent so long with Peter and Rebecca when Viola's backstory and the idea of her haunting was just so much better. They really should have focused more on her, and have her be the main antagonist because Peter took things in too much of an AHS direction, I think.
Also the creative team missed a trick with the virtual effects with the ghost, The blank faces aren't scary but when we saw Viola standing over that kid's bed when her face hadn't fully disappeared? That was genuinely unnerving, that's the look they should have kept. A featureless face isn't scary, but a partially faded one? That was eerie as hell.
As for the other episodes, this series is about 4 episodes too long, I think, maybe even 5. Hell, I think they could have done this story (so far, I guess) as a film. I think having two episodes that cover the same ground in explaining being 'tucked away' was too much. Hannah's episode pushed it but when we basically got the episode with Rebecca and Peter that covered the same subject, it just pushed my patience too far. I really liked the Viola episode though, that one brought me back from the brink of being done with this series.
I dunno whether the last episode will tie everything together but I feel like the plot is very scattered and disparate at the moment. Is Edmund a ghost or an hallucination? At this point, he seems forgotten, and I think there was too much time spent with the characters aside from the children not knowing what was going on, and the other ghosts may as well not exist at this point, it seems. Unless the last episode brings it all together, I think there's sadly just a lot of wasted potential in this season.