Season 4 is better than Season 3. Probably better than Season 2. It does some of the things that Season 1 did very well which make it a decently entertaining but tense watch.

I will say that it's completely misanthropic world-view gets a bit draining. They've improved a bit in that area, but the nihilism get make it a slog at times.

I will say that no matter what, this should be the final season. There's no many places to go, story-wise, especially considering how things are progressing.