I don't hate all melody, I just think people want too much of it[and I am kinda sick of it, after 20 years as a semi-pro to pro musician and someone who works in music, it can get very tiring]. To me it is like harsh noise, after a while i want something very different. Or Ambient or drone, whatever.
I just think it is a time and place thing and maybe in a film about a bizarre other world filled with bio-mechanical terrors, a lot of melody might not be what you want. I don't look at giger and think melody, I look at Giger and think "Merzbow".