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I read Messiah i think and didn't enjoy it one tenth as much as the original, i do have children somewhere, never read it though.
The preludes to dune were awful 
I didn't get much stuff worth listing except Father Ted all 3 series boxset. WOOT |
The prequals were written by Herbert's son and Kevin Anderson for the sole purpose of raping the original books for some cash. And, yes. They were f
ucking horrible. Goddamn fan fiction.