I don't think it's slimy. They could provide a simple, complete unsubscribe button in addition to a list of subtopics to check/uncheck. Maybe I only want to unsubscribe from their blog, or I still want to receive feature update news but not their sales catalog.
As a person who ends up clicking a lot of unsubscribe links: I definitely see it as slimy.
I would rather companies just didn't subscribe me, so having to click an unsubscribe link is already a problem. The more confirmation they have, the more I take it as biased and manipulative.
If I click a link to claims to unsubscribe me, then that's exactly what it should do. I have no problem with a page to manage account preferences, but don't label the UI element that leads there as unsubscribe.
