Season 1 depicted the complexities of human nature. We had people who did bad things, but were still at times good; or the 'good' guy being show to sometimes be bad. People who had gone through tragedy, but in a strangely optimistic way kept going forward. People who had every reason to be as depressed, flat and as Eeyore as they wanted, but that makes for bad tv, so were given complexities. Season 1 was actually pretty humorous, nuanced, charming, etc. Characters were their lived histories, which was sometimes dark, but never completely stifling like they were no longer multidimensional people who were complex and nuanced.
The moral complexity of the second season consistently clunks by repeatedly having one character tell another character "you're bad" or "you're not right" or having awkward monologues where the other character in the scene has to actually ask what he's talking about to remind us, oh yeah or someone flat out doing the "you know what your problem is" trope. There's no charm, no winks, no smirks, no sarcasm, nothing but delivering depressing, pessimistic line after line as if that's interesting or dramatic.
We look at season 1 and say 'well, it's just better tv with only 2 characters!" as if all shows with only two characters are better. Umm, no, it was better because every step of the way the production value was better.
The second season is suffering from a typical sophomore slump. You spend years finding people to believe in your idea and help create a show and give their all to the project from a point of passion, and believe in it and you get amazing results. You then find a ton of success and are asked to do it again, come up with a second script, cast for it from big names that want to be involved. The cast gets bloated, the story gets rushed, actors are doing their jobs but don't seem fully in because they're not.
Hey, if it happened to Jewel it can happen to anyone!