CHERNOBYL was great. I found the final episode with the trial scenes less enjoyable, it felt more fictionalised (even though it wasn't any more fictional, it just felt that way with the obviously anti-realist, Sorkinesque trial speeches).
It's a meaningful story about institutional failure and also the enforced heroism of the people involved—especially the miners, soldiers and divers who were conscripted into the clean-up. The explicitly anti-Soviet side of it was a bit annoying, since you can easily point to similar disasters provoked by other regimes or companies.
Skarsgard, Watson and Harris are great in it, each one sympathetic and reflecting a different emotional position.