be blown away
To be thoroughly impressed, overwhelmed, or excited by something. I am blown away by the show of support from everyone. I was blown away by how good that movie was!
be blown away by something
INFORMALIf you are blown away by something, you are extremely impressed by it. I was blown away by the tone and the quality of the story. I can remember being blown away by the song when he first played it to me.