I used to think that too until during this last year I met several producers of direct to video fare... They flat out do not give a damn if the movies they make are any good. They are all formula films -- meaning that they have devised their very own formula to make these films.
I've worked for those producers.
One producer I shot several movies for had five things he needed:
1) exactly 80 minutes including end credits
2) 3 scenes with nudity (didn't really matter how - a shower scene,
a skinnydipping scene, a love scene)
3) 2 action scenes (again it didn't really matter - a chase, a fight)
4) shot in focus.
5) 2 attractive women
He didn't care about story, lighting, sound or the actors except for
the two attractive women (for the box cover). In a way, it was really
freeing for me as a writer/director. I could do anything I wanted.
He came up with the title and the poster and that was it. He could
sell it and I got paid.
Sometimes I'd have under three days to make it - pick up the equipment
at 4PM on Friday and return it 10AM Monday.
Say what you want, hate it all you want, but I learned a lot about making
movies. While my friends who went to film school were teasing me and
working their weekend job at a video store I was on set directing a movie.