How important is warranty on a firearm?
A warranty is only worth as much as the paper it is printed on. Springfield, S&W and Ruger have some of the best customer service in the industry. Ruger by the way does not provide a "warranty" for their firearms at all yet has a stellar reputation for standing behind their products.
By contrast, Taurus offers a lifetime warranty no matter if you are the original owner or not and on paper it looks great. In real world use, their customer service and repair work is often times very spotty.
Buy a well made gun from a company that stands behind their product and you will be okay.