What does "blow off the doors of..." mean?
The context is as follows:
"The Dark Knight" blew off the doors of what a comic book movie could be. This movie destroyed box office records, making it the number two movie in the United States of all time and number four worldwide.

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I haven't heard the expression before, but in this context it means that it completely exploded/demolished previous terms of reference/expectations of what a comic book movie could be.

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If you 'blow the doors off something', it means much much better than anything else.

It is American English  slang