Messiah was #2 and very much stood on its own. God Emperor was #4 and more dependent on the mythos but still fairly self-contained. Children of Dune was #3, and had less going on in its own right, mostly just bridging the gap between Messiah and God Emperor. Frank Herbert wrote two more books after God Emperor which pretty much just carried on with the world he'd created without particularly going anywhere. After his death, his son Brian Herbert cashed in, churning out dreck based on "found" manuscripts/outlines/dinner napkins. You really can't lump the original works together with what the son did.
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