Yeah, the first season was great. It left me rather worried about the second series: because most of the best characters had been killed off, and the premise wouldn't be shocking any more, I feared the second season would suck!

Fortunately, it didn't. Admittedly, the second series didn't quite live up to the first one - but, it was still good IMO. It established some great new characters, so I ended up not really missing the ones from the first series :P . The only problem was, I thought it was too short: it only felt like half a series!