My thoughts about Season 2:
Korra is infuriatingly dense. Still. I wished she would have learned from season 1 and have some character development going on, but I see none so far. I guess it will happen now that she became amnesiac.
Varrick: Great character. Both in his scatterbrained rich eccentric mode and as a ruthless capitalist behind his benign mask. Took me rather by surprise but they hinted at it with him saying "If you can't make money during a war, you simply can't make money!". This caracter and the show has unexpected depths.
Eska & Desna: Creepy comic relief. Still was immensely amused by the Bolin/Eska "romance". Would be nice if that developed into a kind of daughter-of-religious-fanatic-overcomes-her-upbringing kind of story, but it's too early to judge.
Bolin: Comic relief. I'm sure he will capitalize on his 'movers' star status to the benefit of Korra at some point in the future, but I don't expect him to develop very much.
Mako: I originally figured him bland boyfriend material, but he is probably one of the strongest characters of the show. He is practically the only voice of reason, is competent and responsible and suffers from conflicted loyalties and is not afraid of facing consequences.
Asami: Competent, but a fish out of water. Love rival of Korra for Mako's attention and it's honestly still in the open how that romance develops. My guess is she will get a crash course in cutthroat capitalism.
Unalaq: Red herring bad guy. By now he is established as obvious antagonist using religious pretext to further his personal ambitions. Nothing else.
All in all I am quite pleased. They continue to wrap contemporary social criticism in a series aimed at the age group who need to understand society the most. They touched the 'war on terror', racism and the police state in season one ("indefinite detention" really got a laugh out of me) and now they give religious fundamentalism, capitalism and war profiteering (and later I suspect - propaganda) the same treatment.
And that while delivering a funny and exciting show overall.