It had several great elements. I felt it started stronger than it finished. Which seems to be typical for these miniseries.
, even Breaking Bad's last few episodes declined from Ozymandias.
The score and soundtrack was perfect, from White Rabbit, to Heroes cover by Peter Gabriel, to the actual synth, it was on point with every mood.
Several characters were very well done. Teenagers sorta all sucked.
The Sheriff was cool. The Science teacher was cool.
I felt the government agency should have felt a bit more ominous. They felt like incompetent dupes in the grand scheme. Never fully explored or understood the significance of the agency's existence or experiments that creates the parallel dimension.
The series was either two episodes too long or too short, probably.
I'd give entire series a B+... I've seen it twice, so it holds rewatchability.