'Thorin has a strange relationship with Orcrist. He is drawn to it because of its obvious beauty and fine craftsmanship, but being an Elvish blade his first instinct is to cast it away. It's a beautiful weapon and fit for a king, but Thorin has an almost love-hate relationship with it because of his history with Elves. He realizes it is a very valuable weapon of the highest quality and Elrond says as much, but it's an Elf blade in the end and Thorin begrudges any favour from the people who withheld their help when it mattered the most.'
~ Richard Armitage, DoS Chronicles Cloaks & Daggers