Yes I agree with you. Season 1 and 2 were excellent. Then there was season 3 and I could only watch a few episodes before giving up on it. Haven’t watched it since.
I am about midway with season 2. I will probably watch season 3.
I finally a couple of years ago got around to watching the HBO series “The Wire”. Season One first episode I was hooked and watched the entire first season in a kind of binge watch.
Season two just was not as good and I gave up on it. My take on some these kind of shows is that the first one or two seasons they are on fire and then for different reasons they fall off.
I have watched the first episode of “Taboo” and it is certainly different and I may finish it’s season.