It's not a huge "out-there" kind of view change but...
In my British Literature class back in High School I read both Beowulf and Grendel, by John Gardner.
I was surprised by how much Grendel changed my view on the whole "what was right" within the story Beowulf.
I like the book a lot. I've even recommended it to my father (and my recommending a book to my dad took a lot of guts - this man is well read).
So yeah - not a huge change - just an opening of perspective.
You should read it.
Here's a preview: