Wow. I'm pretty harsh on movies, and I kinda liked Don't Tell Mom The Babysitter's Dead, in spite of the lousy title. It was certainly much better than many other movies with comparable premises or similar tones, like Working Girl. Not as good as Risky Business, though.
I don't think I've ever walked out of a movie at a theater, though I came mighty close during that crummy Narnia movie, The Lion The Witch and the Wardrobe. But my equivalent is probably when I start fast-forwarding through chunks of movies I'm seeing for the first time on DVD. Transformers got that treatment.