I think Season 1 overall was better than what we've seen so far, if only because it seemed more like a coherent whole rather than chunks of various plots put together. Some individual scenes in S2 are ridiculously good (Arya/Tywin, I'm looking at you. Also some Tyrion stuff), but on the whole, it's a bit messy.
On the other hand, ACoK is much harder to adapt than AGoT, so I don't hold it against the writers, who continue to astound me with the quality of the show.
I agree with whoever said Arya was S2's MVP, btw. I really hope Maisie Williams gets nominated for an Emmy (even if she won't win, just the nom would be great).
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When you have nothing to say, quote yourself ~ Solfadore