I'm not a Sam-lover (though I don't have anything against him), but I'll tell you this: Sam does get redeemed in the latest chapters. otp_destiel doesn't truly bash him, insofar as she gives a rational explanation to his behaviour later on and only exploits that which is so painfully obvious in the show. I think it's really sad (and a waste) if you give up on reading, for it's one of the jewels of this fandom, and you're truly missing out on something if you don't read Unexpected Destinies. Besides (SPOILERS!), Sam becomes likeable again towards the end (END SPOILERS!)...