Picking up exactly where season one's finale left off in fact showing (or staging, I'm not entirely sure) the ultimate scene again for further emphasis "Seven Thirty-Seven" as well includes some absolutely outstanding scenes, yet doesn't exclude some unnecessary flaws.
The plot centers both around Walt and Jesse's increased fear of their new colleague in drugs after they've experienced him pulpifying his associate basically just for kicks and the suspicion Skyler develops both on her husband and her shoplifting sister. The first thing you see of season 2 is a mysterious monochrome montage before the credits turns out to be just as fantastic as a conversational highlight between Skyler and Hank about half an hour later. Next to that, "737" impresses with the already mentioned extended season one finale that gets even more rememberable through Tuco's whispering of "You're an ambiguous screenplay gem that sent shivers down my spine. In less dramatic matters, Dean Norris absolutely steals the show with hilarious dark humor and Aaron Paul is great once again as his character gets more and more paranoid. The not-so-nice parts mostly were the moments that Walt and Skyler shared together (a trend that sadly hangs over the whole season) and some irrational choices of Heisenberg and his little compaero that bothered me.
Bryan Cranston's first directorial effort on Breaking Bad is just as well-done as the show's first seven episodes and might include even more stylistic plus points. If it weren't for a handful of weaker parts, this could have even been the best episode at that point.