i know this category can actually break down into a few different sub-categories. like, you might have reasonable expectations for a movie and it turns out to be really poorly done...not funny, not emotive...whatever.
there's also the "plan 9 from planet x" sort of bad...the ones that MST3000 used to mine gold by the sheer mockery factor.
last night my gf and i went over to Dstarz' place for dinner/hawks loss w/him and his fiance. after the game ended he flipped through the channels and found a movie on the SciFi network called Sharktopus. this movie was destined for maximum B- movie status solely due to the Eric Roberts factor. still, i thought even ER had his standards...apparently not.
this was, by far, the worst written, produced, directed, and acted movie i've ever seen. we were sitting there trying to imagine the pitch to get this movie made. i'm not sure where you can find it, outside of the SciFi network, but it's worth a watch just for humor's sake. we only saw the last 30 minutes or so, and maybe we missed all the brilliant work...