Second viewing always helps. You are used to the stucture, and now you are not surprised by ideas which you find disappointing by your first viewing, cause you know what's coming. And then sometimes you begin to like excactly these ideas which you couldn't stand before.
I was disappointed by OUTW the first time. Then it became one of my all times favourites. The Wild Bunch also wasn't love at first sight.
About your films Korano:
Django Kill is a good example for a film which strangeness needs probably time to settle down in your mind before you are able to enjoy it.
The Mercenary still gets better, still grows with every viewing. Dien't liked it too much either when I first saw it.
Some of the others also got better, e.g. 4 of the Apocalypse. Only Kill Them all didn't change a bit.
Death Rides a Horse, I don't know, so many people like it, and I had the strong will to like it, to discover something I hadn't seen before, but after a 3rd watch I'm not sure if anything had improved, even if I give it now a 6/10 instead of a 5.
Maybe only because I'm a bit biased by all the defenders.