A series I eventually gave up on was Terry Goodkind's Sword of Truth series. I really enjoyed the first few, then the story started to seem to go on and on and on and.....
I think I got Chainfire out of the library and sort of skimmed through it, but finishing the series has been placed in the "can't be bothered - have better things to do with my time" category.
I guess the whole never-ending saga thing - one crisis after (yet) another crisis - started to really get to me. Basically I got to the stage where I was wondering to myself "will this story ever END???"