The biggest problem with Sasuke now is that not only he had gone postal on everyone, but he aslo lost all sense of honor, going to the lowest in order to achieve what he wants. Madara who is utterly evil at least still have his great pride who makes him much more likeble than Sasuke right now. Redeem Sasuke is simplily too cheap, it's just like release a guy that started shooting pedestrians in a open street because "he deserves a second chance", that's just STUPID!
I totally agree with you. Redeeming Sasuke would be a stupid choice and the fact that Naruto thinks there's good in him is just as stupid if not more. I honestly can't see Sasuke coming out of this alive and that only his death would be his rightful punishment with no ounce of redemption whatsoever.
I also like your point about Madara. The thing with Madara and Kabuto is that, sure they're evil, but at least they're actually likable. They have this atmosphere around them that makes them charmingly interesting characters. They're the type of villains that make you think of them as badass powerhouses that have quests for power but have this sense of elegancy that makes them irresistibly cool and fun to watch.
But with Sasuke, he's just an unlikable emo douche-bag. He has no redeemable qualities whatsoever. His sense of pride makes him arrogant and hunger for vengeance causes him to go against his own brothers wishes without a second thought. Sasuke Uchiha is about as likable as Anakin Skywalker and Jar Jar Binks from the Star Wars Prequel Trilogy but mixed together to form an unholy abomination.