season 2 is the biggest joke in the history of dragging a perfect season 1 into another. This would otherwise be a 9.5 stars show just based on season 1.
Not for those who prefer a lot of action and fast paced things, a great series, but starts off very slowly (That's NOT a bad thing!) - The acting is top notch and very well done. I've not finished the entire thing but if you're not interested in watching something that isn't action based at all then this isn't for you.
Season two, seemed a bit unnecessarily convoluted, and I couldn't care less if they solved the main murder, but season was superb.
You can start on Season 1 or 2. Where one lacks the other pick ups. Both have a great plot, enjoy the ride.
Two seasons two stories, the second is more accurate as a story, even when you lose some details about intrigues of secondary characters you can't lose the sequence of facts, the interactions of the main characters. The first season instead lacks in that, but has the character of Rust Cohle that is unreachable.