Typical northeast undercarriage. As long as the body sheet metal isn't rusting anywhere, it's not a tremendous big deal. What you may find is that working on the suspension may be more difficult with rusted/stuck bolts when you go to take it apart. If the body shell has rust (floors, rockers, etc) then I'd look elsewhere.
If you come down (I'm assuming you're up north) to southern PA or lower, you won't find undercarriages that look like that. What you see is a result of road salt.