It sucks that the writing for the second season was so convoluted because there really were some moments of greatness in there. The Eyes Wide Shut-esque craziness at the mansion, Velcoro’s dream sequence, the hard-boiled noir feel, and those beautiful aerial sky shots over Vinci with the score. Farrell did some carrying as far as acting went.
Third season was a nice return to form along with stronger writing, so I’ll favor that one. First season is one of the best seasons of a TV show ever but each one has its own different charm that I appreciate.
I think about S2 often because of those moments It's not a good season of television and I was quite frustrated with it at the time, but the highs are incredibly high. I agree the writer through too much shyt in it. I understand what he was trying to do. He couldn't get away with another two detective noir season, so he needed more characters. It just didn't work because there were too many characters, they didn't mesh well, and their individual stories varied in quality.
Another major problem is that S1 felt like a true labor of love. The writer/creator is from Louisiana and you could tell he was intimately familiar with the entire vibe presented. The characters, accents, mannerisms, the way they talked, religion...it all felt authentic. Whereas S2 is based in a fictional city in Los Angeles. Such a weird decision.
Haven't seen S3 yet. Looks dope and I've heard good things.