I have a fair amount of Nikon gear (film, digital, lenses, scopes...) and also had a very ugly warranty situation.
Came down to providing dealers with (limited) product was higher priority than providing product for warranty replacement. Then I became a public relations problem and for them an exercise in damage control and then had a new replacement lens. Took an absolutely unreasonable amount of effort and time to get it done (just about 6 months).
Since then have had excellent service from different people. Expensive loaner lenses when something in for service, complementary sensor remapping whatever. Think at the time a person was making a decision that simply didnt work well for me but in their opinion worked better for the company.
Have used Nikon gear for decades, one bad issue. Talk to some Canon or Pentax people, see if they're any better. Friends had some serious issues there (and no local depot, shipping charges after shipping charges, after shipping charges)...
The only ones that truly amazed me was Tamron. I broke your lens by playing in a sandstorm, can you fix it? Sure, lets just call it warranty shall we? Well, if you insist... Not have lenses in their line up that interest me at this time though.
Have had good service from Bushnell too
http://www.canadiangunnutz.com/forum/showthread.php?t=283459 but only interest me for .22s