well, OP, judging by this thread and the fact that it's pretty split on which season is better and no one bad mouths either means the show is pretty good.
i missed season 1 and am hooked on season two.
i'm currently going back and watching season 1 (on netflix now) but am only an episode and a half in. i'm enjoying it too.
i actually like the fact that season 2 isn't as supernatural and focuses more on the darkness of actual people. because of that, i don't like the alien angle. which they could've pulled off as some kind of psychoisis until arden pulled that thing out of kit.