On Darth Maul:
Darth Nihilius from Kotor II is literally an etheral entity of the Dark-side, his human form was destroyed long ago and he's literally just a ghost.
Darth Sion from Kotor II as well had his body utterly destroyed. His skeleton was reduced to dust, his skin was shredded to pieces and his mind turned to mush, somehow the dark-side perserves him
Darth Malak had the lower-half of his face sliced off by Darth Revan
General Grevious from Revenge of the Sith is an asthmastic robot

Darth Vader suffered from full limb-amputations, he was lit on fire and basically lost his entire outter body, yet he's a live through the wonders of technology and the dark-side.
Boba Fett was swallowed whole by a massive sarlaac that is virtually inescapable, but (at least in the extended universe) he makes it out
Starkiller was stabbed in the heart and launched into deep space, but was perserved somehow
it's ridiculous, but hey, when you really think about it it's not that crazy for a guy sliced in half to survive.
I also agree that the whole "Jedi Code" is rather self-defeating, I'm not going to bother going into the other moral debate. The Jedi demand its members to dehumanize themselves for the sake of preserving those very things in civilization.
that being said, doesn't Luke Skywalker in the EU actually condemn these anti-emotion and draconian practices? In the Jedi knight series Kyle Katarn is a very powerful Jedi, who's officially part of the Order, that Luke regards as one of his right-hand men, but he's also devoutly attached and married to Jan Ores. there're quite a few examples in the post Ep. 6 lore to suggest that Luke radically reformed the Jedi code and what Jedi was allowed and not allowed to do.
for that matter, in Kotor Jolie Bindo's whole story revolves around his distates with both the Jedi Order and the Sith. He hated the Jedi because they condemned his love for his wife whom he secretly married. they accused him of being susceptible to the Dark side, and he was ultimately exiled. He hates them for that because he knows full well he won't fall, and he hates the Sith as much in exile as he did as an official Jedi.