It's decent. There's some great moments and it's much better than gash like Game of Thrones or Walking Dead; but his family are so annoying that it ruins a lot of it.
Also the plot is very formulaic, oh no here's a problem oh okay we overcame the problem it's all good oh no more problems. It just never achieves a status quo for more than an episode at a time which make it feel a bit pointless. If I was a pretentious arse, I could say, "Urrr but it parallels the futility of man and Walter's battle against cancer!" But in reality it just feels like dodgy writing.
I enjoyed parts of it and Walter is an interesting character, but there are much better shows out there.