Most of my exposure to Snopes is pointing relatives worried about things like celebrity deaths, The Onion articles, and that Harry Potter is a satanist to it in an attempt to counteract whatever they were exposed to on Facebook.

At the very least, they seem on the side of sanity against bullshit like that.

As to their politics, they seem to get criticized by both sides [1] - which while not an automatic pass of trustworthiness at least seems to be on the right path.

1 - http://www.snopes.com/info/notes/politics.asp