I have only watched the first two episodes but I am finding it reasonably engaging. The complaints about the acting are absurd. There is nothing wrong here in that department. Perhaps the haters should watch some other Danish television for perspective. Also, compare it to the crap SyFy was putting out during the aughts. This acting is just fine as far as I am concerned.
The other complaint seems to be that the characters do stupid things, but having suffered though the first six seasons of The Walking Dead before I gave up over the stupidity of the writing, (I only made it through one season of Fear the Walking Dead) I have so far seen nothing that is inconsistent with what kids, locked up when they were quite young, would do when they were released into a devastated world.
I plan on continuing watching. It is far better than much of what is currently available on TV or streaming, in the sci fi genre.