Hmm, I guess you got a point.
I guess I'll just put all the Epics and Legendaries I think are worth discarding and then you can give your opinion
Legendaries: Moroes, Barnes, Malchezaar and Shaku maybe but I'm thinking about it.
Epics: Leatherclad Hogleader, Brass Knuckles, Golden Sleep with the Fishes (thinking about it), Unlicensed Apothecary, SpellBender, Greater Arcane Missiles, Dinomancy and Lunar Visions.