I LOVED IT SO MUCH. I won't say it's my favourite (Captain America: The Winter Soldier was amazing on every level, and is hard to beat), but it was great.
My one criticism
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is that the plot seemed a bit thin, but that's just because there was so much information they needed to get across, that the reasons behind the conflict were not always clear. Why Ronan wanted to kill the Xandarians was only expressed in throwaway dialogue. But I had the same problem with Thor: The Dark World, and subsequent watchings of the movie cleared that all up.
But otherwise, AMAZING.
"I must not fear. Fear is the mind-killer. Fear is the little-death that brings total obliteration. I will face my fear. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the fear has gone there will be nothing. Only I will remain."
-Bene Gesserit Litany Against Fear