'So bad it's good' is one of my favorites. But you have to be prepared going into it. If you start a 'so bad it's good' film wanting something decent, you'll be disappointed. If you go in planning to enjoy the terrible, ridiculous, and ridiculous and/or banality, you'll probably enjoy it. If that's your thing.
My favorites of this genre are 'Hobo with a shotgun', 'Dead Snow' (sequel is actually good), and 'rubber'.