I have not really had a bad experience with my warranty service. Had a frontier and it was leaking coolant from manifold and the water pump and the thermostat. At first I was told that it was normal so I got pissed off and told them that I don't know of any vehicle that leaks coolant and is normal. They ended up fixing all of it and gave me a loaner car. Took about a week to fix and never had problems. Only other prob was the window regulator and that was fixed in a few hours. Have you tried another dealer to see how they are??