The band was awesome! They blew everyone away.
What does this mean? Surely it does not mean the band actually blew everyone away. But it seems to mean something good?
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The Free Dictionary, in its article for to blow has the following definitions:
blow away Slang
2. To defeat decisively.
3. To affect intensely; overwhelm: That concert blew me away.
I guess, it's exactly the meaning you need.
It means something good; in fact, blow [someone] away means leave [someone] greatly impressed.
Do note that there are quite a few other meanings for this expression (it might mean kill someone by gunshot or get rid of, for example).