Yeah I've always loved season 2. I found the whole port storyline, along with the mystery of the girls in the container to be compelling. I can't really say why, but I think I found it the most entertaining (in a Sopranos kind of way,) of all the seasons. However, the best still has to be season 4. After my latest rematch (which I just completed today,) I realized that season 3 was better than I remembered, and season 5, despite its obvious flaws (the cartoonish villains at the Sun; the serial killer storyline; the overly-tidy resolution of the final episode,) had a tremendous second half. In fact, episodes 7-9 are among the best the show has produced.
What a series. I wonder if we'll ever see another like it. Now I have to figure what to binge next: Sopranos, Deadwood (one final attempt to try and get what the hype is about,) or Boardwalk Empire.