While I consider myself to be a libertarian-Republican, I certainly am glad that I can vote Libertarian in the absence of an exceptable Republican candidate. I would certainly hate it if the only choice were between a neo-con Republican and a liberal Democrat.
I hate having little to no choice on opting out of social security, the income tax, local zoning laws, and occupational license requirements. Being able to vote for a Libertarian Party candidate is the least of my concerns. And I am a supporter of the Libertarian Party, and usually vote for it when I can, no matter how exceptionally good the Republican or Democratic Party candidates are.