Those are bad movies, but not quite so bad they're good. A good bad movie genuinely tries, but utterly fails at everything. Scripting, editing, acting, cinematography... everything. Yet still manages to provide great (unintentional) comedic entertainment. It's its own genre. Troll 2 is widely considered to be one of the best SBIG movies of all time by many, tho Neil Breen has been making a mark lately, lol.